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Dynamo-Electric Machine

Description: Patent for a new and useful improvement in a dynamo-electric machine to provide a rotor in which certain coils of the winding are automatically cut out and utilized as open coils to prevent the turns in those coils from having a demagnetizing action. Another objective is to provide a rotor whose core consists of non-magnetic material to refuce the inductance and self-induction of the winding and the sparking at the commutator due to the shifting of the magnetic field and the neutral or point of… more
Date: January 10, 1922
Creator: Kuhn, Preston Holmes
Partner: UNT Libraries Government Documents Department

Insect Destroyer.

Description: Patent for an insect destroyer, specifically for the destruction of boll weevils and similar insects. The invention uses heat as the destruction agency and is portable, designed to travel along a row of plants.
Date: January 10, 1922
Creator: Rannefeld, Otto & Halbert, Robert F.
Partner: UNT Libraries Government Documents Department
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