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Electrical Alarm for Window Screens.

Description: Patent for a new and improved window alarm. This design consists in "the window-frame, having the contact-springs connected in open circuit with an electrical alarm, with the screen or frame in the window-frame, having the double contact-points, the contact-springs, and the wires, the contact-point bearing against the spring . . . the point, spring, double contact-points, and the contact-springs being connected together in open-circuit, whereby an alarm will be sounded either by raising the scr… more
Date: August 11, 1885
Creator: Garrett, Henry
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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