USRE7659E - Improvement in lamp-chimneys - Google Patents

Description

R. R. CRUSBY. Assignor to F. 84 Shirley.

LAMP-CHIMNEY.

Reissued. May 8, 1877.

No. 7,659. I

WITN SSES.

' NPETERS PNOTO-LITNOGRAFHER, WASHINGTON, DUO.

UNITED STATES PATENT OFFICE ROBERT R. CROSBY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO FREDERICK STACEY SHIRLEY.

IMPROVEMENT lN LAMP-Cl-HMNEYS.

Specification forming part of Letters Patent No. 79,918, dated July 14,1868, reissue No. 7,659., dated May 8, 1877 application filed April 6, 1877.

To all whom alt-may concern:

Be it known that 1, ROBERT E. CROSBY, inventor, of the city of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Lamp-Chimneys; and I do hereby declare that the following is a full, clear, and exact description thereof, that will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to an improvement in lamp-chimneys; and it consists in enlarging the chimney atright angles, or nearly right angles, at or nearly on a level with the flame, and giving the upper part of the chimney a conical form from this enlargement to the top, for the purpose of securing a larger and steadier flame, and making a shorter chimney, as will be more fully described hereinafter.

The accompanying drawing represents my invention.

A represents my chimney, which has a circular flange or lip made on its lower end for fitting down over and around the burner. This flange or lip B is here shown as perfectly straight, and adapted to one form of burner only; but it is evident that this part of the chimney may be made with the outwardlyturned flange, so as to fit other common burners. At or nearly on a level with the flame the chimney is abruptly enlarged outward at ornearly right angles to any suitable degree, so as to afford a larger space for the flame to spread in, and this horizontal portion 0 forms a radiating-surface, through which the light is freely reflected downward. From this enlargement the chimney tapers upward toward the top, at any suitable angle, where it may be ofany desired size, the sides forming straight level with the flame, in combination with the I conical sides and contracted opening at the top, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of March, 1877.

ROBERT R. CROSBY.

Witnesses: I

CHARLES W. CLIFFORD, WALTER CLIFFORD.

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