US338728A - Joseph s - Google Patents

Description

(No Model.)

J. S. FORD.

LAMP. No. 338,728. Patented Mar. 30', 1886.

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JOSEPH S. FORD, OF PHILADELPHIA, PENNSYLVANIA;

LAMP.

SPECIFICATION forming part of Letters Patent No. 338,728, dated March 30, 1886.

Application filed January 28, 1886. Serial No. 190,126.

To all whom it may concern:

Be it known that I, J OSEPH S. FORD, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Lamps, of which the fol lowing is a specification.

My invention consists in the combination and arrangement upon radial tubular arms of a lamp connected to a chandelier or pipe, through which illuminating-gas is caused to flow, of a series of burners concentric with and between two transparent or semi-transparent glass cylinders, the lower edge of each cylinder resting in notches or sockets formed to receive them upon the upper surface of the periphery of said radial arms of the lamp in such a manner that upon the ignition ofilluminating-gasemanatingfromthe burnertips the flames proceeding therefrom shall be caused to bereflected from each cylinder upon the other, and radiated upon surrounding objects, increasing the brilliancy of light radiated by the use of a single burner surrounded 2 5 by one globe or shade.

The nature of my invention will be more fully understood by the following description.

In the accompanying drawings, making a part of this specification, Figure 1 is a plan view of my improved lamp. Fig. 2 is a side elevation, the globes or cylinders being in vertical section.

Like letters of reference in both figures indicate the same parts.

A is a metallic cylindrical stud, having the screw-thread a out within the central bore upon its lower end, by means of which attachment is made to a corresponding male screw proj ection upon the arm of a chandelier or to a bracket or gas-pipe protruding from a wall or ceiling. 1

b are equidistant radial tubular arms extending horizontally from the periphery of the stud A, in which their inner ends have screwthread connections.

Concentric with the stud A are the glass cylinders O O, which may be made transparent, semi transparent, or toned with a shade of color, to soften the rays of light pro- (No model.)

ceeding from the flame caused by the ignition of gas emanating from the burners. The edges of the lower ends of these cylinders rest within notches or sockets d d upon the upper surfaces of the arms I), (a series of which receive each cylinder,) in such manner as to obstruct but little of the'rays of light that are cast downward. By this construction an open space is formed between the outer surface of the cylinder 0 and the inner surface of cylinder 0.

Projecting vertically from the upper surfaces of the radial arms I) are the burners B, (one upon each arm,) that are so placed thereon as to be equidistant from each cylinder in the space between them.

B is a burner placed upon the crown of the stud A.

By the arrangement of two cylinders of unequal diameters and concentric with each other, having a space between them upon the radial arms of a lamp,with aseries of burners in said space between the cylinders, the rays of light are reflected from the surface of each cylinder upon the other and radiated upon surrounding objects.

It being intended in practice to use burners that permit of the flow of a limited amount of illuminating-gas, by which means I obtain a greater amount or surface of flame through the series of burners than by the use of a single burner with a large volume of flame, the rays of light are more equally divided around and between the cylinders, producing greater radiation, besides being more pleasant to the eyesight and a saving in the quantity of gas consumed.

My invention is an improvement on the well-known single gas-burner on an arm or bracket, surrounded by a globe or shade, in which it is necessary to produce a large flame in one or to ignite gas from a series or number of burners in order to obtain sufficient light.

The burner B may be used at times to obtain greater brilliancy of light.

Semi-transparent glass, opalescent, or that toned by color may be used upon either cylinder to soften the rays of light, if desired.

I claim as my invention tween the adjacent surfaces of the cylinders The combination of the central stud, A, upon said arms, substantially in the manner provided with the burner B, the radial tubuherein shown and described.

1ar arms b, projecting horizontally from said JOSEPH S. FORD. 5 stud, the concentric glass cylinders O 0, rest- \Vitnesses:

ing one within the other upon said arms, and THOMAS J. BEWLEY,

burners 13, located midway in the space he FRANK SCHMIDT.

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