US1438944A - Best available cop - Google Patents

Description

1,438,944. R. 0. CONWAY.

ELECTRIC REGULATOR.

FILED lULY 24. 1919.

"ft-.S'l' AVAlLABLE (Sill Fatented Dec. 19, 1922.

warren stares tease Parent ore ca.

ROY D. CONWAY, OF CHA'I'HAM, NEW JERSEY, ASSIGNOB TO WESTERN ELECTRIC COMPANY, INCORPORATEIJ, or new YORK.

.YORKQ N. .Y., CORPORATION OF NEW ELECTRIC REGULATOR.

-Application filed July 24,

To all whom, it may concern:-

Be itiknown that I, ROY D. CONWAY, a citizen of the United States residing at Chathain, in the county of Morris, State of New Jersey, haveiinvented certain new and 'use ful Improvements in Electric Regulators, of which the following is a full; clear, concise, and exact description. p C Vi This invention relates to arrangeinents for 10-regulating an electrical characteristic offa circuit, such as the intensity of current flowing therethrough. One ofzthe objects of the invention'is to provide a method and means for insuring a constant How of current over '15 a circuit Anotherobjeet-oonsistsin -aproviding means for automatically increasing the resistance iIL-HcCi IGILl iW G J V D hB current flow therethrough has a tendencyp-to..in-

crease; and alsomeansior. automatically; reducing the resistance? iirsaid circuitias the current flow decreases- :A further object consists :in .theigprovision; of .a "method; and

means for cuttinginor out' resistance in a circuit byv successivesteps in order to hold constant an electrical characteristic of a portion of thecircuit. Other-objects of this invention will appear inthe detailed description to be given later. 1

It has often been foundjdesirable to associate- With a work circuit includingEtranslating devices such, for example, asa circuit including the filaments of a vacuum tube repeater, an arrangement for regulating the current flow therethrough.

trical current for the circuit may have a tend ency to vary beyond the limits Within which satisfactory operationof the apparatuswill As it has been found that a vacuum J result. 40 tube repeater will givebetter service ii-thc current flow in its 'tilanient heating circuit' the voltage in this source will cause a circuitto be closed over the needle and one of the contacts otthe voltmeter thereby operating resistance varying mechanism to add a cer-. tain amount of resistance in series with the winding of the voltmeter relay and additional resistance to the ork circuit. It the- This is because 35 the voltage at the source supplying the elec- 1819. Serial No. 313,032.

resistance thus added to'the voltmeter circuit and the work circuit. is insufficient to 'counterbalance the increase in current due to the change in'voltage, the voltmeter needle will not fall back'to neutral position, but will serve to -hold closed the circuit over the contactof the voltmeter; QAccordingly, the resistance varying mechanism will continue to operate and will add further'resistance winding and the Work circuit. until the in- :crease in current flow has been counterbalanced'and theneedle returnedto neutral position. It, the current flow ..-from the :source'decreasespacircuit is closedover' the needle and another. contact otitheivoltineter {which serves; .to operate.- the I resistance {vary- 'i g meohanismto reduce the :resista'nce in the voltmeter circuitia'nd the work circuitin progportion to the'deerease in; voltage.:. w;

Injthe preferred form, this resistance rvarying mechanism comprises a series of relays under the control of'the contacts'ot' the voltmeter. The relays of this series are adapted to control the .associationivith the voltmeter circuit of a plurality of resistance units and'are also adapted'tocontrol an additional series of normally energized relays 'avhich control the-association with-the Work circuit-eta plurality of resistance units:

Means are also provided for insuring the successive action of these two series ot' relays so that only one resistance'n'iay be cut in or out of the voltmeter circuit at one time. Preferably this is accomplished by providing a series of slow-acting relays for trans ferring the control of the-contacts of the voltmeter relay trom'one-or" said resistance controlling relays to the next in order as the voltage supply changes.

This invention may now be more fully un derstood from the following detailed description taken in connection with the accom- 'iany ing drawing which illustrates the preferred form. of the circuit arrangements of this invention.

Connected to a battery 2 is a vol n'ietcr relay 3'which has a needle 4 between two stationary contacts 5 and G. Since these contacts are extremely delicate and easily burned out, needle 4 is connected to an intermediate point of a circuit containing the high resistances 7 and 8 and source of voltage 2, so that onlya fraction of the total potential of battery 2 may be applied to the voltmeter units to theicircuit including the voltmeter 1 after its corresponding relay in the series 11 tol7 inclusive has operated.

EEC

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needle in the case \vherethe total pbtential of battery 2 would be injurious to'the contacts it applied directly. Under the control of the voltmeter-needle Aafilldcontact is. a relay 1() which -controls the successive operation of the relayslin the two series 11 to 17 inclusive and 21 to 27 inclusive; -Eiach'ot' the relays in the series 21 to 27 inclusive is a slow-acting relay designed so thatiit .will not. operate to open or close its contacts until The successive operation of*the relays- 11 lto 17 inclusive-serves'to' a'dd tothe winding of the voltmeter relay, the 'jresistances -31 to 37 respectivelyby the breaking of shunt :paths around said-resistanc'esa' 'lilrese *re'sistan'ces have a value predetermined with respect to the adjustment of the contacts of the voltmeter relayi *Under th'ewontrol of the" movable contacts ofrel'ays -11 to '17 inclusive, are' a series-of normallyenergized relays 411, t2 and 43 Which by their rnova'blecontacts -47, 48' and 49 in turn control resistances 445, and' l'ii whieh are ineluded the speeific arrangement showrf, :1 esistanee tance 45 twice the value of 'resistance in order to obtain various combmations of these three resistances taken sep'arately or together-that will-give seven equalv steps in the' increase or decreaseol the 'ameunt of resistance in the filament' circuit} since 111 the -specific embodiment" shown; seven steps are? Provided for "the increase or decrease in the*1resistance' in the circuit i of the voltmeter relay' Winding. The manner in and winding of relay'lfi' ground. The closing of'the above d'eserlbed'circuit' energizes relay 10 which pullsup' its movable contact and closes" the following circuit: from. ground, movable contact'ofh'elay10, conductor'62, movable contact '63, conductor 64], winding of relay 1'1, conductor 65; windin of relay 21 'to battery and ground. This energizes relay 1l=whi cli pulls upitsm'ov able'contact'67- andis locked, up over the following circuit: from ground an'd bat t'ty, winding Orkney-'21, conductor "65,

eration of relay 10.

winding of relay ll, movable contact 67,, coniiluctors 68, 69 and movable contact Tl) of relay 115 to ground. The energization of relay 11 also serves to pull over its movable contact 51 thereby breaking the shortcir'cuit around resistance 31 so that the closedc rcuit for the winding of the voltmeter relay may be traced from ground,

'b'attery'2; winding of voltmeter relay 8, conductor 50, resistance 31 and movable contacts 52 to 57 inclusive to ground. If the addition of resistance 31 is suiiicient to counter-balance the increase in the voltage ofsource 2, the needle of the voltmeter relay will return to neutral position and thusopeIr thecircuit' formerly closed by the op- As the relay 11 was locked up as formerly pointed out, it holds open the following normally closed circuit 'by-pulling up its lower movable contact 71: iroin ground, movable contact 71, conductor '72, movable contact-73, conductor 74, movablecontact l'b, conductors 76 and 77, winding ofireiay 41 tobattery'and ground. The opening of thi's 'circuit'by the energization of' relay 11, deenergizes relay 41 and opens the 'shnnt' aroun'd resistance t' which nor- -mally 'c0nsists of conductors 79,80, movable contact l? and conductor 81; he beat ingf'circuit for the filament of the vacuum tubes 39'an'd 40 may then be traced as follows from ground, fi laments S2 and 83, choke coil-84,-eonductor 85, normally closed movable contact 49, conductor '86,

normally closed movable contact -18, conductors 87 and 79, resistance 4%,adjustable resistance 88 to battery 2and ground. Thus it is apparent that the deenergization of relay ll has added resistance 4A to the work circuit'to counterbalance the increase in voltage of battery 2 thereby preventing an v increase in the'value ofthe heating currentt'or the filaments 82 and 83. After the relay 11 has pulled up its three movable contacts and has been locked th rough the circuit described above, the slow-acting relay 21 attracts its movable contact (53 so as to disconncct'the windings of relays 11 and 21 from the armature of relay 10 and to connect instead the windings of relays12 and 22 thereto through conductors 9t and 89, movable contact QO, conductor 91, movable contact 63 to the movable contact oi? relay 10. This change therefore makes relays l2 and'22 responsive to the energizetion oi =relay 10. a

it the addition o't'the resistance 31 to the circuit including the voltmeter relay 3 is notsuflicient to counterbalance the increase in the'voltage of the battery 2, the'needle ot' the voltmeter relay'w-i'll not returntoneutral position but will remain deflected" to the right and the'relay 10 will remain energized' anfd after the slow-acting; relay 21 has changedthe'relay underthecontrol of relay E555? AVAlLABLL-l 10 from relay 11 to relay 12, the following circuit will be closed: from ground, movable contact of relay 10, conductor 62, movable contact 63, conductor 91, movable contact '90, conductor 89, winding of relay 12, conductor- 94, winding ofrelay, 22 to battery and ground. The closing of this circuit will energize relay 12 which will pull up its arinatures and becomelockedup over the following circuit: from ground and battery, winding of relay 22, conductor 94, winding of relay 12, movable contact 95, conductors 96 and 69 to movable contact of relay 115 and ground. Theactuation of relay 12 by pulling up its armature 52 opens the short-circuit around resistance 32 so that the circuit of the,'voltmeter. relay winding may now be traced from ground, battery 2, winding of voltmeter relay 3, conductor 50, resistances 31, 32 and movable contacts 53 the slow-acting relay 22 pulls up its lowera-rmature 90 so as to remove the control of relay 10 from relay 12 to relay 13 by including the winding of relay 13 by the following circuit: from movable contact of relay 10, conductors 62, 91, movable contact 90, conductor 110, movable contact 111, conductor 112, winding of relay 13, conductor 7 113, winding of relay 23 to battery and ground. lVinding of relay 22 by pulling up its movable contact 114 removes the looking circuit for relay 11 from under the control of movable contact 70 of relay 115 by causing relay 11 to be locked up instead to 57 inclusive, to ground. ,Thus the circuit; over the following circuit: from ground, and

of, the voltmeter relay winding now includes resistance 32 ,as well as resistance 31. If theaddition. of these two resistances is sufiicient to counter-balance the rise in voltage of battery 2, theneedle of the ,voltmeter-relay will return-to neutral position and thus open the circuit formerly closedby the Operation of relay 10. 1

'As the relay.12-was;locked up, asifornierly pointed out, its lower movable contact 97 has been pulled over to close the following circuit: from ground, movable contact 97, conductors 98, 99, movable contact 7 3, conductor 74, movable contact 75, conductors 76, 77, winding of relay 41 to battery and ground. The closing of this circuit energizes relay 41 whichpulls over its movable contact 47 to close the shunt path around resistance 44. From the pullingup of the, armature of the movable contact 97:of relay 12 the following normally; closed circuit is opened: from ground, movable contact 97, conductor 102, movable contact 103, conductors 104 and 105, winding of relay 42 vto battery and ground. The opening of this circuit deenergizes relay.42,thereby releasing its movable contact 48 and consequently opening the shunt path around resistance 45 which normally includes conductor 106, movablecontact 48, and conductors 87 and 79. The cnergization of relay 12 therefore deenergizes relay 42 to open the shunt path around resistance 45 and subsequently energizes relay 41 to close the shunt path around rcsistance 44. The heatingcircuit for filaments 32 and 83 may now be traced as follows: from ground, filaments 82and 83, choke coil 84, conductor 85, movable. contact 49, conductors 86 and 106, resistance 45, conductors 79 and 80, movable contact 47 conductor 81, resistance 88- to battery and ground. Thus it is seen that the energizatiorilof relay 12 short-circuits resistance 44 and automatically puts instead in the heating circuit battery, winding of relay 21, conductor 65, winding of relay 11, movable contact 67,

conductor .68, movable contact 114 to ground.

Thus it is seen that the energization of relay 11 ceases to be under. the control of relay 115 when relays 12 and 22 have been energized. I v

However, if theincrease in the voltage ,of

source 2 has not been counter-balanced by including in the voltmeter circuit, the resistance elements 31 and 32, the voltmeter relay needle will not return to neutral position,

but will remain deflected to the right. Ac-

cordingly, relay 10 will keep its movable contact pulled over and after slow-acting relay 22 has operated will energize relays 13 and 23 over the following circuit: from ground, movable contact of relay 10, contact 63, conductors 91, 110, movable contact 111,

conductor 112, winding of relay 13, conductor 113, winding of relay 23 to battery and ground. The closing of th1s circuit will onergize relay 13 which will pull up its movable contacts and become locked'up over the closing of the following circuit: from ground and battery, winding of relay 23, conductor 113, winding of relay 13, movable contact 120, conductors 121 and 69 to movable contact 70 of relay to ground. The actuation of relay 13 also serves to open the short-circuit around the resistance 33 thcreby increasing the amount of resistance in the circuit of the winding of the voltmeter relay. If the addition of resistance 33 is sufli cient to counter-balance the change in the voltage of source 2, the voltmeter relay needle will return to neutral. position and dcenergize relay 10.

Since relay 13 has been locked up, the closing of its movable contact 73 breaks the following normally closed circuit: ground, movable contact 97, conductors 98, 99, movable contact 73, conductor 74, movable contact 75, conductors 76, 77, winding of relay 41. to battery and ground. The opening of this circuit decnergizes relay 41 and consequently opens the shunt path around resistance 44. Theenergization of relay 13, how ever, does not effectrelay 42 which has been previously deenergized by the operation of relay 12so that with the operation of relay 13,-the heating circuit {or filaments 82 and 83 includes resistance '44 as well as resistance 45, which was previously added.

Subsequent to the operation of relay 13, relay 23 operates to pull over its movable contact 111 to change .the'control of relay 10 from relay 13 to relay 14, by making the following circuit: movable contact ot'relay 10 conductors 62', 91, 110, 124,1novable contact 125,conductor 126, winding otrelay 14, conductor128, winding ,of relay'24 to battery and ground. The operation of relay 23, by pulling up its movable contact 127, removes the control otthe locking circuit of relays 12 and 22 from under the control of the movable contact 70 b"lOCl Z 1I1g;'tl1 6S6 relays instead over the following circuit: ground and tt n, windi g o 3 12 .99I I I windin off relay .12, 'n 1oyable' contact 95 end r: was n ta le area .1 7 e's Relay 12'therefore ceases to'be' under the control of movable contact 70 when relays 13 and 23 have been energ'ize dQ If the addition otresistances 31, 32 and 33 does not counter balance' the change in voltage of source 2,'th e voltmeter relay needle will remain deflected". to the right and relay 10 will energize relays 14 and 24.- Relay 14 will be locked up over contact of relay 115 and will include resistance 34 in circuit with the windinggot' the voltmeter relay. The pulling up of the movable contact 129 of relay 14willfopen the following circuit: ground, movable contact 129, con- 'ductors.130.f131, winding of relay 43 to battery and ground. The opening ot this circuit will deenergize relay 43 and consequently break the shunt path around resistance 46 which normallyconsists-ot conductor 85. movable contact 49, conductors S6 and 106. The pulling up of movable'contact 129 will also close the following circuit: ground, movable contact 129, conductors 132, 133, movable contact 103. conductors 104, 105, winding of relay 42 to battery and ground. The pulling up oi movable contact 129 also closes the following additional circuit: ground. movable cont-M11129, conductors 132, 135, 136, movable contact 137. conductor 138, lllOVflhtG contact 73. conductor 74, movable contact 75.. conductors 76. 77, winding oi relay 41 to battery and ground. Thus it is seen that the operation of the. relay 14 denergizes relay 43 so'that resistance 46 is added to the heating circuit of filaments 82 and 33. Relays 41 and 42 are also energized to close shunt paths around resistances 44 and 45 so that with the operation'ot the relay 14, only resistance ,0 is included in the filament heating circuit. Resistance 40, as stated above, is equal to tour times the value oi? resistance 44.

After relay 14 has been energized, relay.

24 will operate to include the winding of relay 15 in circuit with themovable contact of relay 10 and willalso operate to remove the locking circuit for relay 13'trom under the control of the movable contact of relay 115. I

If the'voltage of source 2increases still further, relay 1 0 will. cause relay 15 to be energized which will include resistance 35 in circuit with the voltmetenrelay winding so as to counter-balance the increase in voltage of source 2. The energization of relay 15 will also open the following. normally closed circuit: ground, movable contact 129 conductors 132, 135, 136, movable contact 137, conductor 138, movable contact 73, conductor 74. movable contact 75, conductors .76 and 77, winding, of relay 41 to battery ano ground. The opening iot jthisicircuit 'deenergizes relay 41 and causes resistance to be includedin the filament heating circuit so that with the operation of relay 15. resistances 44 and 46 are included in the filament circuit, while the shunt path around resistance 45 remains closed.

The actuation of relay 16 will by circuits similar to those already traced add resist.- ance 36 to the voltmeter circuit. will keep open the shunt around'resistance 46. will open the shunt around resistance 45 and will close the shunt around resistance 44, so that for the sixth .step. in the operation ot the regulator resistances 46 and 45 will be included in the filament heating circuit while resistance 44 is short-circuited.

The operation of relay 17 will include resistance 37 in circuit with the winding of the voltmeter relay, will leave open the shunts to resistances 45 and 46 and will. open the shunt to resistance 44, so that all three resistances 44, 45 and 46 are included in the filament heating-circuit.

It is therefore seen that in the specific embodiment shown seven steps are providedfor increasing'the resistance in .the work circuit or'filament heating circuit for keepto control resistances 149,150 and 151 which may be includedone or more at a time in thefilament heating circuit of tubes 152 and 158. these resistances'being proportioned to each other in the same manner as resist- BEST AVAlLABlE CC)? ances 44, and 46. It is apparent that the main comiuctors 7 6, 104 and 130 may be connected to other sets of relays similar to the set 41, 42 and 43 for controlling through the movable contacts of each set, the amount of resistance in still otherfilament circuits. Thus an additional set of relays 154, 155 and 156 is shown connected respectively to leads 76, 104 and 130 for controlling through their movable contacts the amount of resistance added to the filament heating circuits of other vacuum tubes such as 157, 160 and 158, 159. It is obvious that a very large number of sets of relays such as set 154, 155 and 156 may be connected to the main conductors 76 and 104, 130, all of the sets being controlled by the operation of relays 111 to 17 inclusive.

From the above described operation, it is seen that any rise in voltage of battery 2 which may be encountered may be compensated for to limitthe current flow in the work circuit comprising the filaments of the vacuum tube repeaters. The current Fflow can be maintained within any desired limits by the use of a suitable number of-steps, since it is obvious that this invention is not I limited to the use of. only seven steps in the operation and that the number of steps may be increased or decreased to meet the particular requirements of the work circuit to be controlled.

The above description describes the operation of the system for increases in voltage. A reversal of the process will occur if the voltage should fall in value. If, after the resistances 31 to 37 have. been included in the voltmeter relay circuit and resistances 44, 45 and 46 have been included in the work circuit, the voltage of the source 2 should fall, the system operates to successively cut out of circuit, resistances 37, 36, etc., until the decrease in voltage has been counter-balanced. At the same. time a corresponding value of the resistance in the filament heating circuit is cut out to keep the current therethrough from decreasing.

'lhe manner in which the system operates for decrease in voltage may be'cxplained as follows: Suppose, for example, that the voltage of source 2 has increased to such a value that relays 11, 12 and 13 have been ener-- gized to include resistances 31, 32 and 33 in the circuit of the voltmeter relay winding in order to bring back voltmeter needle 4 to neutral position; and at the same time resistances and 45 have been added to the filament circuit to maintain the filament current constant. Under this assumption, relays 21 to 23 inclusive would also have been energized so that the movable contact of rel-av 10 is now connected to the winding o relay which is the next in series and disconnected from the winding of relay 13.

As has been traced before, relay 13 under these conditions is locked up over the following circuit: from ground, and battery, winding of relay 23, conductor 113, winding of relay 13, movable contact 120, conductor 121 and 69 to movable contact of relay 115 and ground. It now the voltage of source 2 should decrease, the voltmeter needle would be deflected to the left and make contact with contact 6 thereby completing the following circuit: from ground, battery 2, resistance 7 conductor 58, contact 6, conductor 165, winding of relay 115 to ground. The completion of this circuit energizes relay 115 which pulls up its movable contact 70 thereby opening the locking circuit for relays 13 and 23 and deenergizing these relays. The deenergization of relay 13 causes movable contact 53 to shortcircuit resistance 33 thereby decreasing the amount of resistance in circuit with the voltmeter relay winding.

If this reduction in resistance in the circuit of the voltmeter relay winding is sufficient to counter-balance the decrease of voltage of source 2, the needle of the voltmeter relay will return to neutral position and no '1urther operation of the series of relays will take'place. 'The'deenergization of relay 13 also closes the following circuit: from ground, movable contact 97 of relay 12, conductors 98, 99, movable contact 73, conductor 74, movable contact 75, conductors 7 6, 77, winding of relay 41 and battery to ground. The completion of this circuit ene gizes relay 41 which pulls over its movable contacts and closes the shunt path about.

resistance 44 thereby decreasing the resist ance in the filament heating circuit in pro portion to the reduction of the resistance in the circuit including the voltmeter relay winding.

The deenergization of relay 23 allows its armature 111 to fall back so as to put the winding of relay 13 under the control of the movable. contact of relay 10 so that relay 13 may again be energized in case the voltage oi source 2 should increase. The falling back of armature 127 of relay 23 breaks the locking circuit for relays 12 and 22 which consisted of ground, battery, winding of relay 22, conductor 94, winding of relay 12, movable contact 95, conductor 96, movable contact 127 to ground, thereby causing the locking circuit for these relays to be traced instead from conductor 96 to conductor 69 and movable contact 70 to ground. This change of the locking circuit places relays 12 and 22 under the control of the movable contact 70 of relay 115.

' If the decrease in voltage of source 2 has not been counter-balanced by the unlocking of relay 13 and the subtraction from the voltmeter relay circuit of the resistance 33, the needle of the voltmeter relay will remain deflected to the left and hold closed the circuit thron -h the winding of relay 115. The attraction or movable contact of relay 115 will then break the locking circuit just described for relays .12 and22 thereby deenergizing these two relays. .The deen' ergization of relay 12 will allow movable contact 52-to fall back so as to short-circuit resistance 32 thereby decreasing the resistance in the voltmeter relay circuit. The talling back of movable contact 97 01 relay 12 opens the following circuit: fromground, movable contact 97, conductors 98,;99, movable contact 73, conductor 74, movable contact 75, conductors 76, 7'7, windingoi relay 41 to battery and ground. The l'alling back of movable contact 97 also closes the following circuit :y from ground, movable contact- 97, conductor 102, movable contact 103, conductors 104:. and 105, winding-ofrelay'a2 to battery and ground. The opening of the circuitincluding relay all will. deenergize'this relay and open the-short-circuit for-resistance 4st. The making- 0f the circuit including the winding of relay- 42 Vl1l close {the short-circuit for resistance lo. It therefore follows that when relay 12--is deenergized, only resistance 4.4 isincluded in'the heating circuit of thefilaments.

The deenergization. of relay 22 causesthe winding of relay 12.to be put under the 'control of relay 10 by closing the following circuit: movable contact-of relay 10, conductor 62, movable contact-.63, conductor 91, movable contact 9.0,. conductor 89 to .the winding of relay, 12, so that relay 12 may be energizedagain incase the voltage of source 2. should increase. The falling back of movable contact 1140frelay places relays 11 and 21 under the control of relay 115 by locking the two relays over the following circuit: from ground and battery, winding of relay 21. conductor 65, winding of relay 11. movable contact 67, conductors 6S and (39 to movable contact 70 and ground.

it the voltage of source 2 shoulddeer-raise still further, relay. 11 will lie decnergizcd cutting out resistance 31 in the voltmeter relay circuit and resistance 4 1 in the filament circuit. Or it, on the other hand, after the deenergiza-tion of relay 12, the voltage of source 2 should increase, relay 12 would .be energized, resistance 32 would be included inthe voltmeter relay circuit and resistance 45, instead resistance 14, would be included in the filament heating circuit.

This progression in either direction follows from the fact .that at. any time in the operation of the system, the last one ofthe relays 11 to 17 inclusive that is energized is under the control of relay 115, so thatthe actuation of relay 115 for a decrease in voltage may serve to decrease the resistance in the voltmeter relay circuit and the filament heating circuit; and also the relay next in advance of the last energized relay of A f/K13 3 E (if)? the series 11 to 17 inclusive is under the control of relay 10, so that further actuation of relay 10 may increase the resistance in the voltmeter relay circuit and the filament heating circuit for a further increase in voltage. For example, if relays 11 to-1 1inclusive and 21to 24 have been energized, ,relays 14 and 2eare under the control of relay 115 since the. locking circuitfor the tworelays includes the-movable contact of relay 115. Similarly, .the relays 15 ands25 which are the-next two iii-advance to relays 14 and 2 wouldlbe underthe control of relay 10. It the voltage of source 2 should then be in- Ql83.S8Cl,11'6l3;yS 15-. and 25 would be energized, while if the voltage of source 2- was decreased, relays 142 and 2 1 would-be deengized. f v

In order to prevent any sudden change .in current due' to the opening 'orclosing of the movable contacts from injuring-the contacts otstherelaysiassociated with the main COl ldllCtOrSi76 H1O4: .and ';130,s each ot,:these conductors is provided with an alternating current pathiito ground 'consistingi respectively of resistance,- 166 and condenser 167, resistance rlfi8z-and-condenser 169, and resist ance 170 andcondenser 171.

While this'vin vention has :been disclosed iii-particular forms-which have been found desirable, it will be understood that it may lie-embodied in many and-widely different .torms without departing from the spirit of this invention, as defined in "the appended claims.

' What is cl-aimed'is:

1; In: a'system of) distribution, a source of electrical energy," a conductor connected thereto including-a plurality of resistance elements, shunta paths about said resistances, anotherconductor connected to said source including a voltmeter and a plurality 0t resistance elements, short circuits about said second mentioned resistance, a series of relays, locking circuits for said relays, short circuits about the windings of said relays. means under the control of said voltmeter for operating said relays and closing said locking circuits one at .a time in order,

.means under the control of said voltmeter for closing said-second mentioned short cir- .cuits and unlocking said relays one at a time in a reverse order, and means under the con trol of said relays for opening or closing said shunt paths and said first mentioned short circuits. v

2. The method of regulating wherein is employed a circuit to be regulated, a regulating element forsaid circuit, a second regulating element for said circuit, a control means. for said elements, a second control means for said elen'ients, said method comprising controlling said first mentioned element at times in response to said first mentioned means, and at other times controlling BEST AVAllABLE CG? sald. element fo r an increase .in voltage,

transferring the CQILlJIOl ,QffStld eleinentto a e @nd gr ns-afte a d; i ea :in

voltage, ,and caii'sing said second .means .to operate said-elementzfor a decrease in volte: r

The-method, of correcting for changes in yoltage pi a circuit wherein is employed a regulating-element; for-said circuit, a second regulating element forisaid circuit,; a-

control; means for said elements, a second control .ineans-f for; said; elements, said vfirst mentioned means normally controlling said first element, said method comprising causing first, mentioned.;means to operate sa d first; element for; 1 ant ncrease -lI1 -voltage,

transferring the controlof; said first-element to said second,means.af ter said increasein vdlta ge lacingifsaid second element .under the control of said first means and causing said first means to ,.operatesaid second element fora further increase in Voltage.

5, A regulator comprising aregulating element a plurality of relays for controlling said element, one of said relaysbeing slow acting and connections wherebythe energination of. said slow acting relay operates anotherof said relays. i

6. Thecoinbinationof a solenoid, a regulating ,ClQIIIGDt COHt-IOllBd thereby, an impcdancefor. connection in or out of circuit with said solenoid, and a slow-acting relay controlling said impedance. said impedance remaining attiines in circuit with said solenoid when said solenoid is subjected to current ineffective to'produce regulation.

7. The combination of a solenoid, a regulating element controlled thereby, a resistance for :connection in or out of circuit with said solenoid, a relay adapted to be made responsive to said solenoid for controlling saidmesistance, and means comprising a slow acting relay forgplacilig said first relay under the control of said solenoid.

S. A .yoltageresponsive regulator comprising thecombination'ot' a solenoid, a resistance-controlled thereby, an impedance for .varying the current through said solenoid, and a slow-acting relay controlling said resistance and said impedance;

9. The combination of a solenoid. a Work circuit. a resistance in said work circuit controlled by said soleiioid,-a second i'esist of correcting .for .rhaiiges ance forcoiinection in or out of circuit with said solenoid, a relay adapted to be made responsive to said solenoidlor controlling said second resistance, and means comprising a slow-acting relay for placing said first relay under the control of said solenoid.

10. A regulator comprising the combination of a circuit, resistance elements of relative rahies l, 2 and 4t, andineans responsive to a condition of said circuit to combine said 4 resistances for uniform graduation.

11. The combination of a circuit, a pinrality oi non-un formly graded impedance elements adapted to be connectedin saidcircuit, and: automatic means :tor. connectingsaid impedance elements in said circuit in graduation thereof. 1 y 12. The combination of a circuit, a source of voltage in sa d circuit, a plurality of nonuniformly graded impedance such combinations as to provide a uniform elements adapted to be connected in said circuit, and v automatic means responsive .to the voltage? of said circuit for, connecting said impedance. elements in said circu t. in such combinations as to provide a uniforingraduation thereof.

v3.3. The combinationoi' a circuit, asource of voltage in said circuit, means responsive to the voltage of said circuit for maintaining substantially constant theij-jcurrent in said circuit, said means comprising a plurality of non-uniformly graded impedance elements, and means comprising ,a,

series of relays for connecting said impedance elements in sa d circuit-in such, com,-

binations as to providea uniform graduation thereof.

14. The combination of a circuit, a-source of voltage insaid circuit, means responsive.

to the voltage of said circuit for maintainiiig substantially constant the current in said circuit, said means comprising :1 vvoltmeter responsive to the voltage of said circuit, a plurality ol nonuiiitornilv graded. impedance elements adapted to he connected in said circuit, and means comprising a series of relays for connecting said impedance elements in said circuit in such C0111- binations as to provide a uniform graduation thereof.

The combination of a circuit, a source of voltage in said circuit, means responsive to the voltage of said circuit for maintain- .ing substantially constant the current in said circuit, said means comprising a series of impedance elements, each of said impedance elements, less one of the series. hav ing a value substantially doublethe impedance of another of said impedance elements. and means-coinprisiug a series relays for connecting said impedance elements: in said circuit in such combinations as to provide :1 uniform graduation thereof.

16. The combination of a circuit com;

lay of another set of said relays."

17. The combination of a circuit containing a source of voltage, and means responsive to the voltage in said circuit for maintaining substantially constant the current in said circuit, said means comprising a voltmeter, a series of relays for said circuit,

a-s'eries of slow-acting relays for said-cir-'- cuit, movable contacts .for saidrelays, a plurality of resistance units controlled by said relays,- said voltmeter'control'ling at one time a' set ofrelays-comprising one relay from each of said series, and a locking circuit for one of said relays of the set "underthe control of said devicecomprisi'n'g a another set et said r'el ays,

18. A regulator comprising a'solenoid, a source of energizing current -for said" solenoid, an'eIement controlled by said solenoid, and means for automatically"changing the "calibration of said solenoidan amount dependent 'upon the intensity of the energizing force suppliedto said solenoid, said means comprising impedance elements in series with said solenoid and movable contacts-individual to said elements.

19."=A"regulator comprising a solenoid, an element controlled thereby, a source of energizing current for said solenoid,- means for automatically changing the calibration of said solenoid an amount dependent upon the intensitv of the energizing force supplied to said solenoid, said means compris ing impedance elements' and movable contarts individual thereto, solenoids tor said contacts and connections whereby'said solenoids are controlled by said first men tioned solenoid. I l

'20. The combinationof a circuit containing a source of voltage and an electroresponsive device, and means comprisinga plurality of relays responsive tochangcs in said source of voltage for changingthe calibration of said device, each ofa plurality of said relays having a plurality of movable contacts.

21. The combination of a circuit containing an electro-responsivedevice and a source of voltage, a series-of relays 'for said circuit, a series of slow-actingrelays for said circuit, movable contacts for said relays. regulating elements controlled by said relays. said device controlling at one-[time a set of relays comprising a relay from. each of said series, and means comprising a movmeans, and control 'ne'a' movable ,contact of a slow-acting relay-of ,JEST AVAlLABLE C-I'JPv able contact controlled-by one cf the relays of the set normally under-the control otsaid device for removing said last-named set from the control of said device and forplacinganother-set under the control 0t said device- A regulator comprising an'electro-rcsponsive device, a plurality' of sei ies of so lenoids= controlled thereby for progressive operation, and i an armature: contrbl'led by 7 5 one of said' solenoids to remove asolenoid of each-serles" fro'nrthe contact of sard de'vic and to place another solenoid of each series under the control thereof:

23. A regulator comprising' an electro-r SPQIISIVG device," a plurality of 'serie's of lenoids' controlled thereby fo'r' progressive operation, and an armature, controlled by each -solenoid of; one series to Temove'a soledev'ice and }t o p'lafce' aiiother soleii o ol each series under' the control thereof A regulator? comprisihg regulating tlici-e'ilioi ".com1 s ing a plurality of seriesofjrelays foi'ipro gressi-vel operation and -coniiectionsfu ifeieby correspondingTelays "o'f each series are? se u'entiall-y op rated to vary the effectiveness of said'regulating means.- 1 i i 2-3.-'A regulator comprising a plurality of series- =of =relays for progressive operationli and connections l whereby corresponding Tclaysl' of; each' series "are sequei1tially "bper ate regulating elements-and control means there?" for coinprising a plurality ofSeries-bf re: lays torprogressive operation; and" conned tions whereby corresponding relaysof ach' series are sequentially operated to vai=yuie effectiveness of said regulating eleme'nts.

27. The combinati-oniof' 'a pluralityfof \vm-k circuits', and means tor-holding substanti all y constant thd 'currentin saidf fworh armatures individual meter; saidsolenoiclhaving a plurality of armatures individual to Said circuits.

29n'r reg-ulator comprising an elcctroresponsive 'device,-a plurality of relays controlled thereby for progressive operation, v

connections from said'relays, and a pluraL 12 ity of circuits to be regulated, said circuits lacing responsive to the electrical condition of said ccnnection'si 30. A regulator comprising'a voltage rcsponsive device, a plurality of i-elaysron- 260A regulator comprising'a plurality of. 100

ESE"

{rolled thereby for progressive .operat-ion,

(,i'lDllQi'llOZlS from said relays, and'aplurality. of circuits to be regulated. said circuits bcing IQSPOIlSl-YBI-lO the electrical condition-of said connections. s

3i. solenoid, an energizingcircuit therefor, a plurality of relays controlled by said solenoid, regulating element controlled by said relays, one of said-relays operating only: for an increase in the energizution ofsaid, solenoid. another oi -said relays operating; only for a decrease thereof, and meansfor, autoinaticallyvarying the calibration ofsaid solenoid in response tochanges in the energizing ClIClllbOf said solenoid.

32. A voltageresponsivei-regulator C0mprising a solenoid, an energizing circuit for said solenoid, a plurality otrelays controlled by said solenoid. a regulating-clement';controlled by said relays, one ofsaid relays operating only for an increasein' the energize tion of said solenoid, another 'oiisaidlree lays operating only for a decreasethereof, and ineanscon'trolled by saidisolenoidior varying the calibration ofsaidsolenoida 33. A regulator --comprisingi ,:a solenoid plurality of relays controlled ithe'rebyg',

nections whereby one of.saidnrelaysaoper ates for an increase inrtheenergl'zation of said solenoid, another of-said relays -;operat ing for a decrease in the energization ofsaid solenoid, a second s'olenoid, =,contr0lledfiat times by one of said relays and other ,-t'1n 1es controlled bysaid second solenoid-p.v Q 4. ln a system of distribution, a source-oi voltage, a plurality of-Worlracircuits con-f nected to said source, variable resistances-individual to said circuits, means comprising a relay havingan armature and responsive to an increase in "voltage in'said-source for increasing the value of said resistances and means comprising a second relay having an armature independently.movable .of said first armature and responsive to a decrease in voltage of said source 'tor'dccreasing the value of said resistances. 35. In a system of distribution, a source of voltage, a plurality of .workcircuitsfconnected in shunt to said source, variable're-.

sistances included in said circuits and individual to said circuits, means for ma1ntain-' ing substantially constant the current in said work circuits, said means COIIllJllSlTlgAI rew lay having an armature and comprisingv means responsivelo an increase in voltage of said source for increasing the value-'ot'said resistances, and means coinprising a relay having an armature independently movable of said first armature and-responsive to a decrease in voltage of saidsource for de creasing the value of said resistances. f!

86; Ina system of distribution -a -source of voltage, a plurality-of ivorlc circuits con nected in shunt to-said sourceza plurality of.

a said other relay, and aregrilatirig element summers 6GP resistances in each of said circuits iandin dividual to said circu ts, said resistances being adapted to bemade estee -0 inefiective in said circuits. means responsive to a decrease in voltage of said.sourceiorrender-.

ingineflfective aresistance in each of said I circuits, and means responsive, to an increase in voltage-of said sourcefor rendering efiec- Jive a resistance in each of said circuits. 37. Ina systenrof; idistr butiom a source of voltage, a plurahty of work .cireuits con rent in ,voltage i se dsourse-f -rend r r ene .ssistance imeaclr iot said circuits 38. Ina-system of d' is aneeiel ments i s e c isa g l cu s :fon each of,saidresistance si herebyeach reresponsive, to changes ,yoltage of said source: for holding substantially constant,the curr nt in said circuits. said means compris lug-automaticrmeans for controlling the shunt. paths ,of saidresistance elements. g

;,.of voltage, a plurality of work circuits con- .-,necte d;-inshunt tosaid source, aplurality of.

1 resistance.elements'in each of said circuits and individual tosaid circuits a shunt path 1 foreacluof said. resistances whereby ,each resistance may be made ineffective,.nieans for holding substantially constant the current in said circuits,-said meanscomprising electromagnetic .means responsive to an increase I ,in voltage of said source forv opening said shunt paths, and electromagneticv means responsive to ajdeoreasein voltagegof said source tor-closing said shunt paths.

\*oltage,.-a"Wor-k circuit connected to said source and containinga. plurality of resist- 1. ance elements, a voltmeter in circuit with said source, means for clianging'the calibre;

tions in said source, shunt paths fol-said re 'sistances, and a 'pluralityoi; electromagnetic uneans controlled by said voltmeter for successively-controlling a plurality of said shunt paths. v

41. Ina system distribution, source of voltage,-aplurality ofresistance elements, a wvorlr circuit containing said source and .39. In apsystenrof distribution, a source 40. Ina system ofd-istribution, a source of.

ftion of said voltmeter in response to varia- Ad -1, fi .m geu plu yc-ofisverl i c on-i a ted its-shu qz ai sell se, a l r litiof d vidualto said a use shunt path sistance nay beniade .inefiective, and means said resistance elements, a -voltmeter incit and said resistances, electromagnetic nieans re's'pons'i "e "to said voltmeter for controllii 'g the successive opening 'of said" shunt paths for an inertia e in voltage, and electromagnetic me ans responsive us said 'oltm'ete'i for controllin'g the successive closing" of said sliunt paths-for a decreas'e'involtage. Ida system of distributidm-a' source of voltage, a 'j-yoltineter relay, a plurality of; resistance elements? source, said reliiffiliidaiid resistances, shiiiit paths for s'aidi'ies'i stan 1 cha ging thecalibration of 'saidrelay contrbllinglthe easiest I me .iis comprising electromagnetic means'ire; spons'i'vet'osaidvolt'meter'ior controlliiig"the opening of said shii it paths' 'for an increase in wa e; and 'elcti oniap'gnetic }niean's'=re= spons iveto'said voltmeterforcontrolliiig the hunt paths for a decrease 'in' closing of said voltage.

circuit containing "said source, "said resist ance'and said voltmeter, a shunt. pa'tlfifor said resistance. means under the control of a contact of said voltmeter for closing said shunt path, and' ineaiis under the control of another Contact ofs'aid voltmeter for opening said shunt path;

In a system of distribution, a source of voltage, a voltmeter, a plurality of resistance elements, a circuit c'ont'ainingsaid sou r'ce,'t.he\vinding of said voltmeter and" said resistances, a 'plurali'ty of relays, a"

shunt path fo'r each said resistances com prising a"-rnovable contact o'fone' of'said relaysjelectromagnetic means under the con trol-of said voltmeter for controlling said relays for an increase ;in voltage-"ot'said source, and electromagnetic means underthe control of "said'voltnieter for controlling said rela'ys for a decrease in voltage.

46. In asystem of distribution, a source of voltage, a voltmeter, a lplurality of'-resistance eleinents,"a circuit containing said source, tlie Winding of said voltmeter and' said resistances, a plurality of deenergizedrelays, a sliunt'path for each o'f'said resistances comprising a movable contact of one of said relays, electromagnetic means under the control of a"cont'a ct-o'f said'voltmeter in} voltage "of said source, arrdele'c ctic ineiins responsive to said volt-" uit containing said a system of distribution, a source of voltage, aresistanee, a voltmeter, a Work A fAlLABLE for successively energizing said relays for an increase involtag'e ol sai'd source, and electromagnetic means under the control of another contact e f-said voltmeter for successively deenergizing said relays'tor a decrease involtageof' said source.

47;In asyst'e'm ofdistribution, a source of voltage, a- 'voltmeter,'-:a Tplurality ofresistance"ele'ments,' a circuit containing said source, said "resistance elements and the Winding of said voltmeter, aplurality of relaysfuneansj comprising one of said relays for short circuitihg each of said resistances," automatic fmeans responsive to said voltmeter for progressively operating said relays in predetermined order in one direction, and automatic means for locking each of 'said'iela ys a'fter each relay has operated. 4821'11 a system of 'distribution," a source of voltage," a voltmeter in rcircuit with said source, apluialitymfrresistance elements, a ciifouiteontain'in 'said sourc, and' said resis'tar'fce" element -a plurality 'of -relays, m'eaiis' 'oom rising one .i'of saidrelays for short circu- 'ing reach rot? sai d resistances, automatic meansrforprogressively operating said relays in a predetermined order in one direction-to compensate for changes in voltage df sa'id "source; and? means :for: insuring 1 the progressive reverse operation of said Y,\' I ,5: v i 493111 a system of distribution, a source of voltage, 'a voltmeter in circuit with said source,'--a plurality of resistance elements, a circuit containing-said source and said 'resist'ances,- a plurality-of relays, a shunt path for each of said-resistances comprising a 'niovablm'contactpf one ota=saicl relays, electromagnetic-means responsive to said volmeter' for controlling one of'said iela-lys, and automatic means for removing said last men tioned relay from the control of'said' electroma netieineans, and for placing-another of sa'i relays under the control of said electroma'gntic means wherebyfluctuations in the volt-age otsaid source may be compensated. w

'50; In a system of distribution, a source of voltiige, a voltmeter in'circuit with said source, a 'plurality of resistance elements, a circuitmont'aining saidis'ourceand said resistances, 'a-sries-of relays adapted to be operated successively in either 'direction, a shunt path' for each of said resi stances coin prisinga'mova'b'le contactoi' one otwsaul relays, electromagnetic means responsive to an increase involtage 'ot'rsa-id source and-coir trolled by said'voltm'etenfor controllingone of said -relays,' electromagnetic means responsive to lax decrease 'in voltage and, icontrolleddjy said voltmeter forxcontrolling that relay of:said-series which is immediately previous to the one under the controlio'f the said first electromagnetic means, and, means for transferring the control; ofboth said,

Hill

ltlli BEST AVAHABLE CUP,

electromagnetic means to other relays-of said series.

tions whereby sa id' means normally controls one of said relays, and automatic means for removing the control oi said electromag netic'mean's from said normally controlled I relay toanotheif of'said'relays, whereby the opened ina predetermined order.

'52. In a of distributioma source'of voltage,"'a plurality of resistance element's,

shunt 7 paths for" said resistances may be a circuit containingsaid source andsaid res tanc ""Ineans' from said normally controlled 1 relay es,'-a 'voltmeter connected to said normally deenergized' relay for each elements, *a shu'nt path forfe'ach f s'ai d resi'stances comprising a -.contact' of one of said'*'r'elays' "nee ashore-said ol ma y c comprising a second seris'erruays as re moving the control 's'aid electromagnetic to another of said first series of relays whereby I the 'shunt "p aths' "for em d 1 resistances in ay be opened fina 5 predetermined order} '53. Ina system of distribution, a source of vOltage a plurality-bf resistance elements,a circuit containing saidsource and said resistance elements," a voltmeter "con nected to'saidsource, a normally deenergized'relay forjeach of said resistance eleme'nts, jashuntpath for each of said resistances comprising a movable contact of one of said relays,electromagnetic means controlled'by a contact of said voltmeter,

connections whereby said means controls the progressive energization of said relays for opening "said shunt paths, a second electromagnetic means controlled by a second contact of said voltmeter, and connections whereby said second mentioned means controls the progressive deenergization of said relays for closing said shunt paths.

54. In a system of distribution, a source of voltage, a variable resistance, a voltmeter having a winding responsive to changes in said source. awork circuit comprising said source and said variable resistance, electromagnetic means responsive through the intermediary of said voltmeter to changes in voltage of said source for varying the calibration of said voltmetennnd for producing a proportionate variation in the value of said resistance whereby the current in said workcircuit may be held substantially constant 55. In a system of distribution, a source of voltage, a-voltmeter having a winding responsive to changes in voltage o'f said source, a variable resistance in circuit with the winding of'said voltmeterfa second variable resistance, a workcirc'uit comprising said source of voltage and said second variable resistance, electro-magnetic means responsive through the intermediary of said voltmeter tochanges 'in' voltage'o'f. said source-for producing a proportionate variation in the value of said resistances whereby the current in saidwork circuit may-be held substantially constant.

56. In a system of'dist'ributioma source of voltage, a voltmeter,"a'pluralityof resistance elements, an electric circuit comprising said source, said resistance elements and the winding of said voltmeter, a plurali'tyfof additional iresistance' elernents' a work circuit compris ng saidsource ofvolt f" onnec age and said additional *resi'stance }elen'1entsj,= aplurality'oi relays," {shunt athsf under the" j control of said relays for said i re tions for causing a luralit'y o'f said relays i to open theshunt i'jaths of a plurality of said resistance elements in-said electric cir cuit While opening the shunt paths for a smaller number of the resistance elements in said work circuit whereby the current --in said work circuit may beregulated. i

the control of contacts of said relays forvarying the calibration of said voltmeter, a

plurality of Work circuits, a variable resistance in each of said circuits and individual to each of said circuitsyand automatic means under the control of contacts of said relays for producing equal variations in said variable resistances whereby :the current in said work circuits may .be regulated.

-58. In a system of distribution, a source of voltage, a voltmeter responsive to fluctuations in said source, a series of relays under the control of said voltmeter, means under ths control of contacts of said relays tor varying the calibration of said voltmeter, a plurality of work circuits, a plurality of resistance elements in each of said circuits and individual to each of said circuit-s, a shunt path for each of said resistance elements. electromagnetic means for controlling said shunt paths and connections whereby said electromagnetic means are controlled by contacts of said relays.

59. In a system of distribution, a source of voltage, a voltmeter responsive to fluctuations in said source, a series of normally deenergized relays, electromagnetic means under the control of said voltmeter ior. energining said relays, electromagnetic means under the control of said voltmeter. for: de energizing said relays, megnsunder the con trol of contacts of. sniddrelays for. varying the calibration of said voltmeter, 2 plurality of Work circuits, a plurality ot resistance elements in each of said cincnits, shunt pathsfor said resistances,n ezins COID- pr si a et o e ys for) ontrolling. h

of, electrical. energy, a plurality of circuits connected thereto and 1 including, variable .restances, voltme e i c uded e f id c i i sgia plura ity of e ays o rolled y -th ct eni ff aid ol met r, and

ans. u d r theccntr l of lid relays for I rying id re tances- ,6 .a. y teml0iclis bution ource of electrical" energy, a circuit; connectedthereto including a plurality, oi, resistance.

e nts, sh n -paths, bo aid esi t nce.

elements, a voltmeter, another circuit connected to said source including the Winding of said voltmeter and a plurality of resistance elements, short circuits about, said second; mentioned resistances, a. series of relays operated by said voltmeter iii-response,

to a variation in the voltage ntlsaid' source.

andmeans under the control of. said 'ielz ys for opening or closing said'short circuits and said shunts.

62. A regulator comprising ,a solenoid, an element controlled thereby, and means forv ance elements, inoyablc contacts. individual to said elements. and solenoids individual, to said contscts,

3 A r gulates wmmi nsi- 0% plurality of, relnys controlled; thereby, means whereby one of snidl'relays operntes. for. an increase in, theenergizntion of. said solenoid, Another of said relays operating for a decrease in the energizntiomot said solenoid, an. impedance. in, c rcuit \vithsaid solenoid and controlled said, solenoid, Al1(l;21 regulnting element controlled by, said; relays.

til. In a system of distribution, 2,, source of electrical energy, a, plurality of circuits onnected thereto ,nnd including-ver fiable resistances a voltmeter, inclndeddn .oneiof said circuits, a solenoid controlled-,hy theaotion of sari d voltmeter, I animez ns nnder the control of said solenoid for vsryingsaidres SlSt2L11C S. I V

n, .vs ri i otistribe we of ii l energy, vsl meteselili e di to. said our es ssiesiot el ye-lw s: o trolled y e he miss at s id: vdtm t s ar;- p t ng-1 u ce s lis h slexsholnded; in ai l e e p a i y ptnormsll e s- 75 s ed elays on rol d; e slise i s lays, time er nsl nse l esisble r esistance. eers qm-i e dsos e elework cii'cuit, and Ine ns controlleghbyijsg id.n mally energized .rel ays. for, vory ng s aids re; sistance.

66. In a systemof distribntion 3.4;.SQlL-If68. of electrical energy, a plurality-cfcircuits connected thereto, variable, resistance elements associated with ench of saidici-rcuits a series of, relays. associated with, cache .0; said circuits .ztnd. controlling, the. variable resistance elements; zissocieted therewith, means controlled by a variation ,in the volt :1 go at said source for ,con trolling;one [of said series of; relays, and mesns controlled by said last mentioned series of ,relaysgion con trolling another oi said series otgreleysi;

In witness whereof, I herenntossubsoribe my. name thisfilst day 0f- -Jn-ly Ai D.., l9l9 95 ROY Di. CONWAY. v

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