US396951A

US396951A - James ward packard

Info

Publication number: US396951A
Authority: US
Publication date: 1889-01-29
Anticipated expiration: 1906-01-29

Description

(N0 Model.)

J. W. PACKARD.

REVOLVING PHOTOMETER STAND.

Patented Jan. 29, 1889.

'INVEN OBI,

WITNESSES:

' ATTORNEY.

N. PETERS. Phnlc-Llmngnpher. Washmglnn. m;

-UNITED STATES PATENT OFFICE.

JAMES WARD PACKARD, ()F NEIY YORK, Y.

REVOLVING PHOTOMETER-STAND SPECIFICATION forming part of Letters Patent No. 396,951, dated January 29, 1889.

Application filed May 19, 1388. Serial No. 274,435. (No model.)

To all whom it may concern.-

Be it known. that I, JAMES WARD PACKARD, a citizen of the United States, residing at New York, in the county of New York and. State of New York, have invented certain new and useful Improvements in Revolving Photometer- Stands; and I dohereby declare the following i to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appcrtains to make and use the same.

My invention consists in a revolving pho clip by which the revolving portion of the stand may be locked in certain positions.

In the manufacture of incandescentelectric lamps it is necessary to calibrate each lamp to determine either its candle-power with a standard current or the. amount of current necessary to give it a standard candlepower. To facilitate this operation I have designed the following apparatus, in which i X, Fig. 2, is the table to which the standard S is screwed. \Vithin the standard is a vertically-adjustablc spindle, A, held in position by the thumb-screw N. Upon the upper end of the spindle A is a revolving bearing, upon which two or more arms,P I of insulating material, are fastened in any suitable manner. At the outer end of each arm is a lainpsocket, M M. Within these sockets are ren'iovably placed the lamps 1. Cables formed of two electric wires insulated one from the other, and designated by the letters E E in Fig. 2, connect the electrodes of each lampsocket with the binding-screws D F and I) F on each of the revolving arms, respectively.

The bimling-screw D is connected with the contact-piece Y and the binding-screw F with the contact piece or brush II. In the same way D and F are connected, respectively,

with Y and II. The stationary contactpiece is held to the top of the spindle A by r the set-screw B and electrically connected with the said spindle. At a point/below the revolving arms the rubber ring, shown clearly in I ig. 3, is fastened to the standard A, and the contact-piece I is thus fastened to the said spindle, but insulated therefrom. Upon the contact-piece I is thebinding-screw K. These contactrpieccs may be rigid or they may be 1 of a yieldingnature, such as well-known forms of. contact-brushes, contact-springs, etc.

The bearing Q, (shown in detail in Fig. 41,) to which the arms I and I? are fastened, has .a spring-clip, T. (Clearly shown in Fig. 4.) This spring-clip drops into one or other of the notches Y upon the spindle A, as shown in. Fig. 2, whenever a lamp, as Z, is in position to be calibrated, as indicated in Fig. l.

The electrical connections are as follows: The current enters through the connection \V, as shown in Fig. 2. It follows the directions indicated by the arrows through the standard S, spindle A, contactpiece C, contact-piece Y, the binding-scrt-nv ID, through one wire of the cable E, through the lamp circuit Z, back through the other wire of the cable E, the binding-screw F, the contact piece or brush II, eontactspiece I, the bindingscrew K, and the wire \V,to the other terminal of the external circuit.

Fig. I shows the stamlard lamp Ti and the photomcter-raek R with its scale and the sliding gage G, which has its two pieces of oil-paper and the disk of opaque material between them, in. the manner customary in photometers of this type.

In operation one man can devote all his attention to the photometer and the variable resistance which determines the calibration of thelamp which is in line with the photometer while another operator is removing another lamp already calibrated and placing a third in the socket thus vacated. \Vhen this operation completed, the spring-clip T is lifted and the stand revolved until it looks in. position for a repetiti on of the operation.

\Vhile I have shown but two arms in the revolving portion of the stand, it is evident that three or more might be used without in any way varying my invention or requiring such changes in construct-ion as necessitate further illustration.

Having therefore described my invention, both in essence and detail, what I claim as new, and desire to protect by Letters Patent,

1. A revolving photometer-stand which has the following parts in combination: two revolving arms, each of which carries a socket for an electric lamp, a set of two contactpieces on each arm and connections between the contact-pieces and the electrodes of the lamp-socket, together with a standard which has two stationary contact-pieces insulatedone from the other and corresponding to the sets of contact-pieces on the revolving arms, which stationary contact-pieces form the terminals of an external electric circuit, substantially as described.

2. Arevolvingphotometer-stand which has the following parts in combination: two revolving arms, each of which carries a socket for an electric lamp, a set of two contactpieces on each arm, and connections between these contact-pieces and the electrodes of the lamp-socket, together with a standard'which has two stationary contact-pieces insulated one from the other and corresponding to the sets of the contact-pieces on the revolving arms, and a spring-clip for lockin g the revolving arms in one position when the stationary contact-pieces touch any one of the revolving sets of contact-pieces, substantially as described.

3. The combinatiomina photometer, of the stationary standardlamp, the sliding gage, and the revolving photometer-stand, which has sockets for two lamps, whereby while one lamp is being calibrated a second lamp may be removed and a third substituted in its place, substantially as described.

a. The combination, in a photometer, of the stationary standard lamp, the 'sliding gage, and the revolving photometer-stand, which has sockets for two lamps and electric connect-ions for the same, whereby while one lamp is being calibrated a second lamp may be removed and a third substituted in its place, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES \VART) PACKARD.

.\\'itnesses:

CHAs. H. SoNN, J'No. M. ROBERTSON.