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Involuting Drawing Instrument

Description: Patent for drawing instrument intended for drawing involuting curves. Includes illustration and instructions.
Date: August 11, 1914
Creator: McCaskill, Oscar E.
Partner: UNT Libraries Government Documents Department

Silo.

Description: Patent for a new silo design made of hollow tiles "to provide dead-air spaces within the tile, for the purpose of preventing the rapid passing of heat or cold through the tile" (lines 13-16) including instructions and illustrations.
Date: August 11, 1914
Creator: Sellors, Edward M.
Partner: UNT Libraries Government Documents Department

Hydrocarbon Vapor Generator

Description: Patent for a hydrocarbon vapor generator. This is an invention for the vaporizing hydrocarbon fluids. Illustration included.
Date: August 11, 1903
Creator: Shelton, John Franklin
Partner: UNT Libraries Government Documents Department

Churn.

Description: Patent for an apparatus for operating churns and ice-cream freezers. To operate, one turns a handle, and through a series of gears, pulleys, and wheels, the cream is stirred. The churn container rotates and sits in a frame where the apparatus is fixed above it.
Date: August 11, 1896
Creator: Martin, James W.
Partner: UNT Libraries Government Documents Department
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