US109537A - Improvement in lamps for railroad-cars - Google Patents

Description

R. S.' MERRILL.-

Gar Lamp.

No. 109,537. Patented Nov. 2z, 187.0.

Wnesses RAP WASHINGTON. D C.

* Ctnitrt Y Seite @anni effin;

RUFIIS MERRILL, BOSTON, MASSAOHUSETTS, ASSIGNOR TO HIMSELF, JOSHUA MERRILL, AND WILLIAM B. MERRILL, OE SAME PLAGE.

Letters Patent, No. 109,537, dated November 22,1870.

IMPROVEMENT IN LAMPS FOR RAILROAD-CARS.

The Schedule referred to in these Letters Patent and making part of the lame.

To whom. it may concern Be it known that 1 RUFUs S. MERRILL, of Boston, in the county of Suolk and State of Massachusetts, have invented certain new and useful Improvements in Lamps for Railroad Gars, and other purposes, of which the following is a specification.

My invention relates to argand lamps, having anaperture in the lower part of the lamp-body for the admission ofthe air, which forms the central draught; and

Its object is to adapt lamps of this kind for use with the ordinary cylindrical lamp-holders or brackets now generally in use in railroad-cars and other places.

The holders or brackets referred to consists of a cylindrical body or cup, into which the'body or oilreservoir of the lamp is tightly fitted, so that it may not rattle or be shaken about in the bracket. when the cars are in motion.

If, however, the body of the lamp is a plain cylinder, so as to t against the sides of the holder, little or no air can pass down between .the sides of the lamp and the holder to create and keep up with regularity the central draught.

.'ll1erefore,'in applying an argand lamp to a holder, such as referred to, it is necessary to provide, not only-'that it shall littightly in theholder, but also that space may be left leading from the upper to the lower part of the lamp-body, through which air may pass to the central draught-passage ofthe lamp.

To accomplish this result is the object of' my invention, which consists in forming a series of corrugations or depressions upon the exterior of the body of an argand lamp in such manner that when the lamp is placed and fitted in the holder, air-passages will be formed by said corrugations or depressions, leading from the upperl part vot' the lamp to the lower part, or bottom, where the month of the .central draught-passage is located, thus supplying the burner with the requisite amountof' air without preventing in any waythe lamp-body from tting tightly within the holder.

yThe manner in which my invention is or may be carried into effect will be readily understood by reference to the accompanying drawing',- in which- I Figure 1 is a perspective view of an argand lamp,

4 made in accordance with my invention.

Figure 2 is a vertical section of. the same, to-v gether with the lamp-bracket or holder in which it is placed.`

The body of the lamp may be made of glass or "metal, and it is of such size and shape as to it snugly within the holder to which it is to be applied.

In the present case its general contour is cylindrical, but a series of corrugations, a, are formed y upon its exterior, which extend from its upper part to its base, so 'that when the sides and bottom of thelamp come in contact witlnthe cylindrical but smooth or plane surface of the holder, a series of passages ywill be formed, which will'admit air to the central draught-passage of the lamp, no matter how tightly the lamp-body and the holder are fitted together.

This is shown in fig. 2, where;

A represents the lamp-body;

B, the holder, of ordinary construction;

b, the lower opening or mouth of the central draught-tube; and- .f

c, one of the air-passages between the sides of the lamp and the holder. if

In the present instance, the corrugations extend a slight distance underv the bottom, so as to conduct the air to the opening bj, bt, instead of this, knobs, or like devices, may be formed onor applied -to the bottom of the lamp for a like purpese.

The bottom of the'lamp, at its periphery, ex-

tends below the central part, where vthe mouth b islocated, so that the lamp-body may rest upon a dat surface with perfect steadiness, at the same time that'air passes without hindrance under the bottom to the central draught-tribe.

rlhe chief advantage, however, of' my invention is that it allows an argand lamp to be applied t'o and used with lamp-holders or brackets ofV ordinary construction without necessitating the least'alteratiou or change in the same.

In lieu of corrugating the exterior of the lamps, I studs or knobs may be formed thereon, or the body may be otherwise constructed, so as to tit closely within the holder', and yet leave passages for the admission of air to the central draught-tube.

Having now described my invention, and the manner in which the same is or may be carried into effect,

What I claim, and desire to` secure' by Letters Patv ent, isf The combination, with a lampholder or bracket, constr'uctedso as to inclose the oil-vessel, as de,- scribed, of an argand" lamp, fitting in the said holder, and corrugated or otherwise formed upon .its exterior, as Aspecitied, so that under all circumstances no matter how closely the lamp may fit within- `the holder, spaces will be left between the holder and lamp-body forthe passage of -air to the central draught-tube, substantially as show-n and set forth.

In testimony wherof, I have signed my name to this specification, before twosubscribing witnesses. RUFUS. S. MERRILL.

Witnesses z M. BAILEY, EDM, F. BROWN.

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