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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
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