US1055420A - Gas-analyzing apparatus. - Google Patents

Description

v LSANDERS. GAS ANALYZING APPARATUS. APPLICATION PILEDNOV. 26, 1910 2 SHEETSSHEET l.

1 X Q/Mfa, Q VHMQ was I g vwc Vt-foe, 35 13 attozu e1 0 Patented Mar. 11,1913.

BEST AVAILABLE COP BAT N 'I OFFICE.

nnwrsisninnm or m-y1oamnz m lestones. 'ro-sanoo sum. savmo & ENGI- mnme co.,'orm ronx,Nex s- OGRPOBATION or NEW roan.

' pg init at onsmsvember as, 1910. Serial No. 594 277.

Patented Mar. 11. 15933.

To all -wizom itma concern! I Be it known t ii'at lyLaw'ts'Sarmsas, a citizen of the United States, 'residin' at New York, county and Stateof New ork, have invented .certain new and. useful Inprovements in Gas-Analyzing Apparatus, of which the followingis a to] clear, and exact descriptionfi v This invention, relates to'apmratus for analyzing gases todeterinine t eir composition quantitatively with respect to one or more constituents, for example sulfur dioxid, oxygen, carbon dioxid, and other gaseous compounds and elements.

More particularly the invention, while capable. with suitable modification well within its spirit, of use for the analvsis of other gaseous mixtures, is designe more especially for the determination of the carbon dioxid content of furnace gases.

As is well known, carbon dioxid (C0,) is formed by the chemical combination of the carbon of the fuel with the oxygen ofthe air 'in the proportion of one atom of carbon to two of oxygen. As this represents complete combustion it is evident thata record of the CO, content of the furnace gasesis a direct indication of the degree of perfection to which the carbonaceous fuel has been lmrned, and is therefore a reliable guide to elliciency and economy in firin Thus a high percentage of carbon dioxi in the furnace or flue gases without evidence of carbon monoxitl shows high efliciency in fuel consumption, and, conversely. low eiliciency is indicated by low carbon dioxid content. Knowing this, and having before him an accurate record of the CO, content, the firen'an can proceed intelli ntl to'maintain the proper proportion o fue to airsupply so necessary to the inost efiicient performance of thefurnace Various t pes of apparatus for making such a reco have been prop se'd. and som of them have proved successful in praetice. f' As :a result of Tlongfitmiliarity with such instruments I have niedto devise my prescntlinvention, which has for" its one: object to provide improved instrumentalities for thept rpose, especiall in the direc tion of 'gre aterjaceuraey an of'less sensi tivenossi to 1 disturbing influences both internal and external. I

A further object; is to simplify the apparatus, both as to construction and operation. to the end of minimizing liability of derangement in the course of ordinary usage.

A still further object is to provide an apparat'us which can be built up of units.' whereby what is in effect a single machine can produce separate and independent records of the combustion in the several furnaces of a battery of furnaces. A further objectis to so construct and organize and so associate such units that. they may all operate with the same degree of accuracy.

To these and other ends the invention consists in the novel features of construction. arrangements of parts, and combinations of elements hereinafter described, and wore particularly set forth in the appended claims.

It may be here stated that the invention can be embodied in a considerable variety of forms, and that these may also differ widely in details of construction and o e ration. Of these various embodiments I have selected for illustration and specific description herein the one which at the present time I consider to exem lify the various features of the invention in their most convenient and effective form. This construction is shown in the accompan ing drawings and will now be described in etall, but the reader should keep in mind the fact, stated above, that the apparatus specifically described is merely the preferred and by no means the only embodiment of the invention.

Referring is a side view of the apparatus comprising four units, with portions of two omitted. Fig. 2 is a cross section of a unit, somewhat diagrammatic in character. Figs. 3 and t are detail sectional views of the recording pen or marker.

hThe gtlse s which are to be analyzed are led from the several furnaces through individual ipe-lines to the respective analyzing units 0 the recorder. Each of these pi a lines includes a perforated sampling tuiio (not shown) extending into the path of the gases at a convenient and suitable point, for exam lethe last pass of a boiler, and the pip'eines deliver their gases to individual filtering and drying devices (not shown) in which the gases are filtered and dried.

From'these devices extend pipes 10, one for now to the drawings, Figure l liltl .jeachuiiit, connectedthrougliili. uidfsealsll to a bus-pipeor" main. 12 whic is in turn haust J-fan'coin-f-v connected to 1a motor an bination 13."1 i

individual valves-14m '1; pi -"15con'veying a suitable '-inert liquid, pre erabl paraflin oil, from a supply reservoir 16w1th which said pipe is in communication throu ha pipe 17 extending downwardly into-position to dischar e into a waste receptacle 18 and having va ves 19,' 20, above andbelow the point of juncture' with the pipeclo; By manipulatin these valves the quantity of oil 11' in he several seals can be nicely regulated, to afl'ord such resistance to the flow of gas as to make the rate of flow the same in all the sampling lines. From this function the seals may be aptly termed equalizin devices. For the purpose of observing tie'operation, so that the desired regulation can be more conveniently effected, the vessels 11 are made wholly or in part of glass.

Just outside the equalizing devices the inlet pipes are connected with sampling tubes 21, through filters 22 each com rising a cylindrical chamber containing a rush 23 (Fig. 2) surrounding the orifice of the sampling tube,'so that an gas entering the latter must pass throng the brush and thus be freed from the last trace of solid or liquid impurities.

The sampling tubes 21 extend down into connection with vertical i s 24 on a horizontal conduit 25 connec e to a siphon 26 and also, through a tube 2'7 to the Oil reservoirs 16. These vertical pipes support'the inlet. or measuring burettes 28, each of which has its upper ortion in the form of 45 an enlargement or c iamber 29 terminatin in annpwardly extendin neck 80 of sma diameter. Assume now rat the measuring burettes are full of oil and that the siphon is operatin As-the oil level falls in the co pi es 24 be ow the orifices 81.01 the sampling tu es the suction produced by ,the descent of the oil draws samples ofgas from the filtering devices 22, the force of the'su'lction. of course de endenton the head being as due to the siphon 2 ,which head is uniform throughout the s stem. The measuring burettes ar e thus lled with gas from the res ective ,furnaces,. and, as soon as the 81p on-ceasesto flowytheinflowyot oil from the reservoirlti throughthe pipe 2'Lbegins to fill the system, again. As the oil rises in the pipes 24 1t eventually closes 'the:inlet orifices of. thesat'nphng tubes, thereby. prevcntmg ngressonle ress of as thereatand entrapping ine'ach urette tie same'volume g'riss. Continuing to rise in the burettcs the oil-forces the gas out through the capillaryftubes132 which deliver*the gas into v absorbing vessels 33 atthe bottom thereof. 5 From' t-he foregoing-it will} seenthat whenfthe fan is ini'o erat-ion 'gas' ifromthe j diti'erent furnace s'-'-}wi ll, be 'fdrawn' fromfthe several 1 furnaces --through"= the pipes 10 fan'df. seals 11. -Thelatter,a.t connectedlthrough' "Thes'e'vessels, are filled with a solution capablis er-rapidl absorbing carbon dioxid, for ex am 1e a solution of caustic potash )iii Bllbblihg 11) through this solut-ion ,the-;gas is deprived of its carbon (lioxul. and-being thereby diminished in volume by .an'amount proportional to the quantity of C0,. originally contained. From the absorption vessels the gases pass into the ascending legs of the inverted U-shaped tubes 34,;whose' descending legs are connected to o en-toppedrisers 35 on the conduit 25. he'pom ts of juncture, 36, of the tubes 34 with the risers are below the sampling tube orifices 31, and hence are closed before the gas begins to enter the tubes 34 from the absorption vessels. Being thus prevented from entering the risers, the gas flows from the Outlet tubes 34 through tubes 37 into the recordin vessels or burettes 38. These latter, simi ar in form and size to the measuring or inlet burettes 28, are connected by a conduit 39 to a common displacement vessel 40, open to the atmosphere; the system coir taining such quantity of parafiin oil that when the recording burettes are also in communication with the atmosphere (through the tubes 34 and risers 35) the oil, or other liquid employed, will stand in the narrow necks 41 of the recording burettes and above the bottom of the displacement vessel.

Flowing into the recording burettes the gas, under ressure, displaces the liquid therein, forcing it out of the burcttes and into the dis lacement vessel, the amount oi oil displace being of course proportiomd to the volume of gas remaining after the carbon vdiovid is absorbed in the vessels 33. Inasmuch as the quantity of CO. in the original gas can never greatly exceed twenty per cent. of the original volume, and in practice is, at most, considerably less, it is unnecessary to make any record it tho volume remaining after removal of the CO does not exceed eighty per cent. of the initial volume, and accordingly the recording devices are constructed and arranged to be inactive until a volume of gas equal to ul least eighty per cent. of theoriginul volume has entered the recordingburettc. For this pur rise a float 42 is provided in each rccor mg burette, with means for keeping the that stationary until the (lcsccnding oil level has reached'tha eighty per cent. point; that is, the point indicating substantially pcrfeet combustion. The float is of annulmform, encircling a slender tube 43 and connected by fine rods 44 to a cross piece 45 below the lower end of said tube, the conneotin rods being of such length that. tho float will stand at the eighty per cent. level,

upwardly through the guide tube 43 is a slender rod or stem 46, connected at the top to a thin cord or thread 47 passing over a Attached by its delicately journaled wheel 48 and support ing by its depending end a body d9 of suifll cient weight, with the marking pen, to counl terbalance the float 4Q. Carried by the counterweight 49 is a marking pen 50 having a laterally turned marking point 51 and a depending leg 52 adapted to dip into an open vessel 53 containing ink at each descent of the pen. It will therefore be seen that the pen receives at each cycle a fresh supply of ink, to compensate for the amount consumed in making the record, so that its weight does not vary from cycle to cycle; and inasmuch as the amount of ink consumed in making the record is exceedingly minute the change in the weight of the pen during any cycle is too minute to disturb the balance of the float. The wei ht of the marking device is therefore in e ect constant. The counter weight 49 is connected to the cord 17 by means of a threaded stem 49*, sothat by simply turning the latter the pen may be raised or lowered, as may be necessary to bring it accurately to zero when the machine is put into operation.

\Vhen a volume of gas equal to eighty per cent. of the initial volume has entered the recordin burette the oil level reaches the float. I now, more gas enters, that is, if the amount of CO in the original volume was less than twenty per cent. of the whole, the oil level in the burette will continue to fall, thereby allowing the float to descend and the marking device to rise, making a vertical mark on a graduated record sheet wrapped around a horizontally revolving record drum The vertical shafts on which the drums are mounted carry worm gears 56, meshing with worms or endless screws 57 on a horizontal shaft 58 driven by a powerfulclock 59, the gear ratio being in the present form such that each drum makes one revolution in twenty-four hours. If the machine is makingsay, twenty records per hour, the motion of the drum is relatively so slow that the mark traced by the pen, through theoretically a curve, is in reality simply a vertical line. Since the descent of the float and consequently the ascent of the marking device are dependent in extent upon the volume lost by the gas by removal of its contained carbon dioxid, it will be seen that the height of the line traced on the record sheet indicates inversely, so to speak. the percentage of CO in the original sample of gas. Thus, no mark at all indicates twenty per cent. carbon dioxid, and a line of maximum height indicates no carbon dioxid. By suitable graduation and calibration the percentage of carbon dioxid in the original gas can be read directly from the record.

The guide tubes 43 are sealed in the tops of the recording burettes, and extend not only well above zero level of the oil in the necks -11 but also well below the level in the recording burettes at maximum displacement, so as to prevent any possible escape of gas. The liquid stufling box thus provided is practically frictionless, since the stem 46 rises and falls in a column of oil.

\Vhile the record is being made, as above described, paratiin oil from the reservoir 16 is flowing into the conduit and rising in the siphon 26 and risers 35. At the instantthe floats 42 in the recording burettes reach their lowermost positions, that is, when the record is completed, the siphon begins to.

flow and the oil in the measuring or inlet burettes to sink, thereby relieving the pressure on the gas in the recording burettes. As soon as the orifices 31 are uncovered gas again enters the measuring burettes, and shortly thereafter the descending oil in the risers 35 uncovers the orifices 86, thereby permitting the head of displaced oil in the displacement vessel 4-,0 to expel the gas from the recording burettes through the tubes 37 and 34 to the risers and thence into the atmosphere. Thus the surface of the displacenient liquid in each burette is at the end of each cycle put in freecommunication with the atmosphere through the respective riser. \Vhen the siphon ceases to flow oil again begins to ascend in the measuring burettes and the risers, and the cycle described is repeated.

It will be observed that when the oil in the recording burettes is at zero position, and therefore standing in the narrow necks 41, with a small surface of the oil exposed, the oil level in the measuring burettes is below the necks 30, with a large surface exposed. On the other hand, by the time the oil rising in the lastm'entioned burettes has reached the necks and the oil surfaces have become small, the oil levels in the recording burettes have fallen far below the necks 41 and hence have large surfaces exposed. Thus the ascent of the oil in the measuring burettes is relatively slow at first, but is rapid during the last portion of its rise; whereas the acwmpanying movement (downward) of the oil in the recording burettes is at first rapid but becomes relatively slow during the making of the record. The advantage of this is that any effect which change of temperature may have on the vol ume of the oil in the measuring burette will, in the course of the cycle. be compensated in the recording burette. For example, an increase of heat whirl] would cause a slight but abnormally high oil level in the neck 30 will have no appreciable effect on the level in the recording burette, since at such time the oil level therein is falling at a much slower rate than that at which the oil is rising in the neck 30. ,Moreover, the use of the narrow necks or tubes 30 and 41 insures that the expulsion of the gas by the rise of liquids in these tubes will be rapid and hence will be more effective in carrying along bubbles of gas than would be the case if such rise were slow. It will also be observed that the records do not depend upon any displacement of the absorbing liquid by which the carbon dioxid is removed. This is a highly advantageous feature, for the rea son that it is unnecessary to have a constant and accurately known volume of absorbing liquid, it being sufiicient to keep the absorption vessels filled, whatever their size. Moreover, the gas can be allowed to bubble through the liquid instead of depending on surface absorption, thereby securing more rapid and eificient action. The absorbing vessels are connected -by a supply pipe 63 to a supply tank 64 containing caustic potash solution, valves 65, 66, and 67 being provided so that any absorbing vessel can be drained or 'filled independently of the others;

The tank 64 is charged by placing therein suitable quantities of water and caustic potash, a suitable stirrer actuated by a handle 68 being provided to accelerate the dissolv ing of the caustic.

The ,oil discharged from the siphon 26 and received by the receptacle 18 is con- Veyed from the latter tothe reservoir 16 by means of a pump 70, connected to the two vessels by pipes 71, 72. An overflow pipe 73 may e provided to carry any excess oil from the reservoir back to the waste receptacle.

From the foregoing description it will be seen that while the several units are supplied with fresh gas by the same agency, namely, the suction through the pipe line 12, and the operation is carried out in all the units by another single agency, namely, the fluid pressure in the tank 16, the units are independent of each other in operation, each making its record without affecting the rest. At the same time, the records made by the several units are made simultaneously and not successively so that it is not necessary to await the registering of all the furnaces in turn before another record can be made.- The time lag, that is, the time between the withdrawal of a sample of gas from the flue and .the i'naking of the record, is reduced to a minimum chiefly by means of the powerful sucl ion produced by the fan 13. The only adjustmentsrequired in putting themachine in operation are setting the marking pens to zero by turning the threaded stems 49, and regulating the quantities of liquid in the equalizing devices to produce the same degree of sue tionv for each unit. Instead of mixing the' caustic outside the machine and then pouring the solution into theabsorbing vessels, a procedure which usually results in spilling more or less of the mixture on the recorder, the solution is mixed in the tank 64, which forms part of the machine, and is conveyed to the absorbing vessels pipes. The apparatus is independent of temperature, by reason of the compensating action of the measuring and recording burettes; in addition, the same paratfin oil is. used over and over again in the successive cycles, thus keeping the parts at constant temperature.

As previously stated, the apparatus herein s ecifically illustrated and described is merely the preferred embodiment of the in: vention, which may be embodied in other forms without departure from its proper spirit and scope.

I claim:

through valved 1. In a gas analyzing apparatus, the combinat1on-of a plurality of analyzing units each including a recording vessel adapted to contain a liquid, a common displacement receptacle into which the liquid in the recording vessels is displaced by volumes of gas delivered into said vessels, and recording devices for the several units dependent for operation upon descent of the liquid levels in the respective recording vesselsas the liquid is displaced therefrom.

2. In a bination with a plurality of analyzing units each including a recording vessel adapted to contain a liquid, of a common displacement vessel in communication with the several recording devices, and independent recording devices associated with the respective recording vessels and dependent for operation upon displacementof liquid therein. 1

.8. In a gas analyzing apparatus, the combination of a recording vessel adapted to contain a liquid,-a displacement vessel in constant communication with the recording vessel and constantly open to the atmosphere, intermittently operating recording devices associated with the recording vessel and dependent for operation upon variation of the level of the liquid therein, and means for putting the interior of the recording vessel into free communication with the atmosphere at the end of each recording operation. i

4. In a gas analyzing apparatus, in combination, a measuring vessel 'adapted to con-' tain liquid to be displaced by gas. admitted to the vessel, a recording vessel adapted to contain a liquid to be displaced by the gas admitted thereto, means to convey the gas from the measuring vessel to the recording vessel, intermittently operable recording mechanism dependent for operation upon gas analyzing apparatus, the comthedisplacement ofihql quid i tru ers, ing vessel andLmeans'jjconnected with the; fitndmeans for supplying a liquid to the 'fmeasuring vessel through its lower portion measuring vessel dependentupon the. dis placement of the liquid therein for putting the'interior of the'recordingvessel into free communication with. the'atmospherefi; a

5; In a as analyzing apparatus,the 'combination o .a measuring v'essel,a recording vessel having a' contracted upper portion, mea'nsfor conve ing' gas from the first to the second-name vesse ,a displaceable body or liquid. in the recording vessel, standing in the contracted upper portion of the vessel when at zero position, and recording mechanism associated with the recording vessel and dependentio'r operation on displacement of the liquid in the recording vessel.

6. In a as analyzing apparatus, the combination o a recording vessel having a contracted u per portion, a body of 11 uid in said vesse and displaceableby gas a itted through the contracted upper portion of the vessel, said liquid when at zero position standin m the contracted upper portion, a measuring vessel having a contrac ed upper portion, means for conveying gas from the measuring vessel through the contracted upper portion thereof to the contracted upper portion of the recording vessel, and means for introducing a liquid into the measuring vessel at a position of relatively large diameter below the contracted upper portion to force gas out through such contracted portion and into the recording vessel through the contracted portion thereof whereby the li uid in the last mentione vessel will be displaced-downwardly out of its contracted portion.

7. In a gas analyzing a paratus, a measuring vessel having its. ower portion of large diameter relativel to its upper portion, a recording vesse havin its upper portion of small diameter relatively to its ower portion, gas-oonveyin means connecting the upper portions 0 the vessels, a displaceablc body of liquid in the recordin vessel and havin its initial level in the sai upper lportion o the vessel, intermittently operab e recording mechanism dependent for operation upon displacement of the liquid in the recording vessel downwardly out of the u per portion and into the lower portion, an means for supplying liquid to the measuring vessel throitilg he ower portion thereof to expel gas erefrom through the upper portion and into the recording vessel to displace the liquid in the latter.

8. In a as analyzing apparatus, the combination o a recordin vessel containing a displaceable body of liquid and havin an upper portion of small diameter in w nch the liquid stands when at zero position, a gas measuring vessel having a lower portion of large diameter, gas-conveying means conthe upper portions of the vessels,

toex el gas through its upper portion and into t e recording vessel throu i the upper portion thereof to displace the liquid in said recording vessel.

9. In a gas analyzing apparatus, the combination" of a recordin vessel having an upper portion of small iameter, a displaoement vessel of large diameter, open to the atmosphere and communicating with the lower portion of the recording vessel, means for utting the recording vessel into commumcation with the atmosphere through the upper portion of the vessel, and a body of liquid displaceable from the recording vessel by gaseous pressure and standing in the up er portion of the recording vessel when t is same is in communication with the atmos here.

10. n a gas analyzing apparatus, the combination of a recording vessel having an upper portion of small diameter, a body of liquid in the vessel and displaccable throu h the lower ortion thereof, said liquid at its initial position standing in the said upper portion of small diameter, and means for elivering as to the vessel through its said upper ortion to displace the liquid.

11. n a gas analyzing apparatus, the

combination of a recording vessel adapted to contain a displaceable body of liquid, u guide tube extendin downwardly into the vessel from outside t 1e same, said tube havin both ends 0 on and havin its lower orifice below the owest level of die liquid, a float in the vessel having astein extending upwardly through the guide tube, and recording devices operatively connected with saidstem.

' 12. In a .gas analyzing apparatus, the combination of a recording vessel adapted to contain a displacenble body of liquid, a float inside the vessel, a stem connected to the float and extending u )wardly outside of the vessel, and a friction ess liquid stutling box for said stem.

13. In a gas analyzing apparatus, the combination of a recording vessel tltittpiuti to contain a displuceable body of liquid, recordin mechanism dependent for o eration upon isplacement of such liquid and harin D. stem extending into the vessel, and u frictionless liquid stufiing box for said stem.

14. In a gas analyzing apparatus, the combination of a recording vessel adapted to contain a downwardly displuccable body of. liquid, a float inside the vessel, means for holding the float submerged until the liquid level has fallen to a predetermined point. and recording devices operntively connected with the float.

15. In a gas analyzing apparatus, the combination of a recording vessel udupled preventing rise'of the- "tloatitp theysurfaceo i the" liquid 'whenjjthei latteris at'lts initial position, wherebydesc'ent ofgth liquid'will cause no movement ofthe' float until the liquid 1 has fallento f a v predetermined level, and Irecordin" fmechams nected witht e float.

16. Ina gusfanalyzing" apparatus bination, o p contain -a ,downwardly displaceable' body of li uid a'counterbalanced'float inside the vesse .adapte d* to?" submerged until the liquicli's displaced toi s-predetermined point and p to float on 'the' surface of the liquid thereafter, and recording jdevicesoperatively associated with 'the float.

17. In' a gas analyzing apparatus, in combination, gas samplm tubes, measuring burettes, absorbing vesse s and recording vessels and a common siphon, said siphon adapted to draw a sample of gas into said measurin burcttes and to forcesaid sample througn the absorbing vesels and into the recording vessels substantiullly as described.

18. In a gas ana yzing apparatus, in combination gas sampling tubes, measuring burettcs, absorbing vessels, recordin vessels,

t co

means comprising a si hon adapts to draw a sample 0 gas into t e measuring burettes said means adapted to force a measured quantity of sai as from the measurin hurettes through t e absorbing vessels, an the means also adapted to place the recording vessel into communication with theatmosphere after each recording operation.

19. In a gas analyzing apparatus in combination, gas sum lm ubes, equalizingdevices, measuring ure tes, absorbingvessels and means to supply liquid from a common supply to said equalizmgdevices whereby the gases in the measuringIvessels are maintained under equal conditions of pressure.

20. In a gas analyzing apparatuia in combination sampling tubesmeasuring vessels means adapted to supply gasesirom sai tubes to said measurin vessels, absorbing vessels containing-a su tance adapted. to remove a constituent from the gas, recording vessels normally filled with t uid,' and a common means to pass ,thea oresaid absorbing vessels intgsaid recor mg vessels wheieb the liqluid in'said recording vessels is disp acedan a record made. 21. In a gas analyzing apparatus, the combination o af;plurality of anal zmg units each including measuring an recording vessels, independent gas-sampling pipe-lines for the several units a common suction main for the pi e-lines or drawin samples of as througrall simultaneosu y, equalizing cvices associated with the pipe-lines for equalizing the suction therein, means for ipli fi ely con-Q v v 7 binat o'nfofa plurality 0 1 ted t 'gtls sa'mpling pipelines for the respective a.,recor mg vessea up 0 a I v a conveying gas samples from the pi pe-lmes to the res ect-lve' measuring vessels, means for 1 deliverlng as from the measuring vessels to the respective recording vessels and removinga gaseous constituent in transit, and recording devices associated with the respective recording vessels.

"122. In a as analyzing a paratus, the comi analyzing units,

units acommon suction main for the several ip'e-lin'es liquid seals between the pipeinesnnd thesuction main, and means for varying-the quantity of li aid in the seals inde endently of each otter whereby to eq'ua i'zethe suction on the pipe-lines.

23. In a gas analyzing a paratus, the combination o a plurality oi analyzing units, gas-sampling pipe lines for the respective units a common suction main for the several pipe-lines, liquid seals between the pipeines and the suction main, a reservoir adapted to contain liquid for the seals, a system of piping for conveying liquid from the reservoir to the seals, and valves in said system enabling the quantity of liquid in an seal to be varied independently of the ot ers, whereby to equalize the suction on the pi e-lines.

24. a as analyzing ap aratus, the combination with a plurality oi analyzing units each including, a measuring vesse a recording vessel, and an absorbing vessel adapted to contain a liquid capable of absorbing a constituent of the gas as the same passes through the absorbing vessel in transit from the measurin vessel to the recording vessel; of a tanlra opted to contain a supply of absorbin .li aid :1 system of iiping connecting t e a sorbing vessels wit 1 the tank; and valves in said system enabling the absorbin vessels to be filled and emptied indepen ently of each other.

C25. In a as analyzing ap uratus, the combination with a plurality o analyzing units,

vessel and removing a constituent of the gas I gas in transitof a i c-line common to the sovfrom the measuring vessels throu h the said p p eral measuring vessels; means for supplying a liquid through said pipe-lino to the combination with a plurality of analyzing units each having a measuring vessel, means connected with the top of the vessel for conveying gas therefrom, and a gas-sampling pipe-line connected to the lower portion of the measuring vessel to supply samples of gas thereto; of a pipe-line common to the several measuring vessels and connected to the lower portions thereof; means for supplying a liquid to the measuring vessels through the common pipe-line, whereby the liquid rising in the measuring vessels will serve to expel gas therefrom; and a siphon associated with the pipe line to empty the measuring vessels periodically, the siphon 15 operating when the liquid has risen to. a predetermined height in each measuring vessel, the outflow ofliquid from the measuring vessels producing a suction to draw fresh samples of gas into the measuring vessels 20 from the gas-sampling pipe-lines.

In testimony whereof I affix my signature in the presence of two subscribing Witnesses.

LElVIS SANDERS.

Witnesses:

M. LAWSON DYER, S. S. DUNHAM.

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