US45648A - Photographic glass-rack - Google Patents

Description

UNITED STATES PATENT GEEICE.

WILLISON G. SMITH, OF CARLISLE, PENNSYLVAIA.

PHOTOGRPHIC GLASS-RACK.

Specification forming part of Letters Patent No. 45,648. dated Decembel` 27, 1864.

T0 all whom it may concern:

l of corrugated metal a, whose grooves or de- Be. it known that I, WILLIsoN G. SMITILot' pressions should be of the same width and Carlisle, in the county of Cumberland and State ot' Pennsylvania7 have invented a new and useful Improvement in Photographic Racks; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification.

The drawing consisting of one figure, represents my improved rack in elevation.

The racks now used in the photographic art for preserving and drying negativesand other plates of glass and metal are shelves of wood with grooves sawed out cr otherwise cut upon their faces, usually by hand, and requiring skillfulness in the workman and the best of material, because it is necessary that the grooves be cut true and that they be coincident with those in the opposite shelves, and that they be not liable to become distorted by warping or by the contraction and expansion ot the wood in which they are cut.

My improvement consists iu constructing a frame like, A, with as many cross pieces B U l) as are required for the siae and height or capacity of the case. The breadth of the cross-pieces and upright sides is to be about as shown in the drawingsuf'icient to make a secure berth for the glass or plate used. Upon the opposite 'aces of the cross pieces B C l), l secure, by tacking or otherwise, 'stri ps depth, and those of opposite strips be opposite to each other, so that the panes of glass or plates when inserted in the grooves shall stand in vertical parallel planes.

The strips or plates of metal may be corrugated in any suitable way. It' of sheet metal, they. may be swaged or crimped, and if cast their corrugations may be formed in that operation 5 or they may be formed in any other way by which a corrugated surface can he produced, or guides, which would be equivalent to the corrugations, may be made upon a metallic or other suitable surface secured to the shelves.

By constructing racks in this Way they will hold about double the number ot' negatives of the ordinary wooden cases. I distinguish the grooves ofthe rack, as shown, by attaching a number opposite each series, so as to assist the operator in enumerating the plates of glass or metal and enable him readily to select the required plate or glass.

y I claim as new and desire to secure by Letters Patent- (Jonstructiug the grooves on the shelves of photographic racks substantially as above described.

WILLISON G. SMITH.

Witnesses:

W. M AGEEELY, JNO. MGFEELY.

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