US40594A - Improvement in lanterns - Google Patents

Description

. UNITED I STATES PATENT OFFICE.

JAMES S. ATTEBBURY AND T. B. ATTERBURY, OF PITTSBURG, PA.

IMPROVEMENT 'IN LANTERNS.

Specification forming part of Letters Patent No. 40,594, dated November 17, 1863.

To all whom it may concern:

Be it known that we, JAMES S. ATTERBURY and T. B. ATTERBURY, both of Pittsburg, in the county of Allegheny, State of Pennsylva nia, have invented certain new and useful Im provements in Lanterns and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making apart of this specification, in which- Figure 1 is a diametrical section through the lantern. Fig. 2 is a front View of the same. Fig. 3 is a horizontal section through Figs. 1 and 2, as indicated by red-line as .22.

Similar letters of reference indicate corresponding parts in the several figures.

To enable others skilled in the art to make and use or invention, we will describe its con struction.

This invention relates to that class of Ian terns in which are employed solid-glass globes for protecting the flame of the lamp from currents of air, &c. These globes are 1 usually cast in molds adapted to the purpose,

and in this operation of casting we form a circular depression, a, in the side of the globe, adapted to receive a concave reflector, b, as shown in Figs. 1 and 3. This depression a is formed by having a corresponding elevation on the inside of the mold, if a mold be employed in blowing the globes. The metallic reflector b is constructed so that its polished surface will exactly fit the corresponding convex surface of that portion of the globe which is depressed. This reflector is then applied to the globe and secured in the depression prepared'for it by means of plaster-of-paris or any other suitable cement, as shown at d d, Figs. 1 and 3.

By applying a metallic ItflGCtOI' directly to the lantern globe or glass, as above described, it will be seen that we are enabled to exclude air from the surface of the reflector, and thus prevent this polished surface from being tarnished from this cause. Ve also obtain a glass surface for the reflector, which surface constitutes a part of the globe itself, and being interposed between the metallic surface and the flame of the lamp, this glass surface forms a shield and protects the reflector from being soiled by the smoke of the oil or injured by constant cleaning. The light is also reflected the two thicknesses of a glass globe, which, with our invention, acts as a double-convex lens and gives a very brilliant light.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

A metalplate reflector, in combination with a lantern-globe, substantially in the manner and for the purpose set forth.

J. S. ATTERBURY. T. B. ATTERBURY. Witnesses: I

A. S. NIoHoLsoN, THOMAS J. HORN.

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