US339451A - Magic lajspeebhs - Google Patents

Description

2 sheets-sheet 1..

(No Model.)

T. H. MGALLISTER. LAMP PoR MAGIC LANTERNS.

N0. 839,451. Patented Apr.' 6, 1886.

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ATTORNEYS.

2 Sheets-Sheet 2.

' (Nq Model.)

T. H. MOALLISTER.

LAMP FOR- MAGIG LANTBRNS.

No. 339,451. Patented Apr. 6, 1886.

INVENTOR: Jt 01'/ ATTORNEYS.

WITNESSBS W UNITED STATES Partnr lirica@ LAMP -FOR MAGIC LANTERNS.

SPECIFICATION forming part of Letters Patent No. 339.451, dated April 6, 1886. Application filed January 28, 1886. Serial No. 190,134. (No inodeld T0 all whom 7115 Tiwy concern.-

Be it known that I, THOMAS H. McALLIs.- TEP., of the city, county, and State of New York, have invented a new and useful Improvement in Lamps, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which- Figure I is a front elevation. Fig. 2 is a vertical transverse section taken online :r .r in Fig. 8. Fig. 3 is a sectional plan view taken on line y y in Fig. 2. Fig. 4 is a diagram showing the relation of the lamp to the lantern in connection with which it is to be used. y

Similar letters of reference indicate corresponding parts in the different iigures of the drawings.

My invention relates to the class of lamps employed in connection with magic lanterns and other optical instruments, and is designed to secure a uniformly-illuminated field. It is common to provide lamps for this purpose with double wicks; but when such wicks are arranged parallel with each other and with the axis of the lenses oi' the instrument the break in the flame which unavoidably occurs between the two wick-tubes causes a dark spot upon the center of the screen, which is objectionable.

The object of my invention is to obviate this difficulty, and I accomplish this end by arranging the wick-tubes of the lamp diagonally with reference to the axis of the lenses, as shown in Fig. 4, so that the two llames from which the light emanates overlap each other, thereby avoiding the dark space.

In addition to the features above described, my invention consists in a metallic chimney having an enlarged portion provided with a reflector and with a removable glass window, as hereinafter more fully described.

To the top of the reservoir Aoi' thelamp are secured two wick-tubes, B B', which are arranged diagonally across the top of the lampreservoir, and are provided with the usual spindles, a, and spurs attached thereto,for raising and lowering the wicks contained by the tubes.

To standards b, secured to the top of the reservoir Ais secured a chimneyholder, C, which surrounds the wick-tubes B near their upper ends, and contains a perforated diaphragm, c, which closes the opening in the chimney-support, with the exception of slits for the wick-tubes B. A stop, d, is secured in the chimneysupport at right angles to the center line of the reservoir of the lamp, and the cone D, which is common to both wick-tubes, has a segmental portion removed from one edge thereof,to admit of placing it in the chimney-holder C within the stop d, and to cause it to register with the wick-tubes. Thelower portion, E, of the chimney is of cylindrical form, and has an opening, e, in oneside thereof, with a bar, f, extending across the open side at the bottom of the chimneyand received within the stop d. The edges of the section E ofthe chimney are l'lattened at opposite sides of the opening e, to receive the glass plate g, which closes the opening e, and is heldin place by flanges h., riveted to the top'of the chimney at opposite sides of the opening e. The glass plate `gris prevented from escaping from behind the flanges h by bending the lower ends of the flanges, as shown in Fig. L.

To the inner surface ot' the body E of the chimney opposite the opening c is 'fitted a curved mirror, i, which reliects the light from the back ofthe flame ofthe lamp through the opening e.

To the top of the body E is litted a cap, F, corresponding to the general forni of the body, and having a iiatteued side, j, which extends across the open side or' the body E, and causes the cap to register with the other parts ofthe lamp. In the middle of the cap is formed an elliptical opening, k, which is surrounded by an upwardly-projecting collar, Z, for receiving the upper portion, G, of the chimney'.

The lamp is provided with the usual screwcapped opening, m, for the purpose of lilling.

The lamp is placed in a suitable position in the lantern, with the opening e facing the con densers.

Having thus described my invention, what I claim as new, and desire te secure by Letters Batent, is-

1. In a lamp for lanterns and other optical instruments, two or more wick-tubes arranged diagonally with reference to the axis of the lenses of the instrument, substantially as here in shown and described.

2. In a lamp for optical instruments, the

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combination, with the diagonally-arranged Wick-tubes, of the chimney-support C, provided with the stop d, the cone D, having a portion of one edge out away to canse it to register Wit-h the wick-tubes, et metallic chimneybody, E, open in one edge thereof and provided witli a glass plate, g, the cap F, having the elliptical opening 7c, and the chimney-top G, iitted to the elliptical collar, substantially as herein shown and described.

3. The combination, in a lamp for optical instruments, of the reservoir A, provided with the diagonally -arranged Wick-tubes B, the ehi niney-support G, the chimney-body E, open in one side, the glass plate g, the cone D, the

centrally-apertured cap F, and the chimney-top G, substantially as herein shown and described.

4. As an improved article of manufacture,a. lamp formed of the reservoir A, diagonallyarranged Wick-tubes B, wick-operating spindles a, the chimney-support C, provided with the stop d, the chimney-body E, open in one side, the glass plate g, fitted to'ggthe opening', the curved reflector z', the cap Rand the chim- 4Dey-top G, substantially as herein shown and 2 5 described.

THOS. H. MCALLISTER. Vi tnesses:

JOHN D. SHAW, GEO. M. FULLER.

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