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Elmer Sperry: Gyroscopic Compass, 1914

Sticking to the Rules: Rule 3

When the invention is a composition of matter, specimens of the ingredients and of the compound sufficient for the purpose of experiments, and to preserve in the cabinet of the Franklin Institute, shall be furnished by the inventor.

View the lantern slides used to aid in examination of Sperry's gyrocompass. The last image is a circuit blueprint of Sperry's invention.