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Electric Call or Signal Apparatus.

Description: Patent for a new and improved electric call or signal apparatus. This design consists in "a telegraph or telephone circuit, the combination, with a polarized electro-magnet and a short circuit around the same, which is closed when the magnet is transversed by a constant current of a given polarity, of a battery having the proper pole to line, a switch for connecting the line and battery circuits, and a telephone in the battery circuit, whereby the telegraph or telephone line may be tested" (lin… more
Date: October 18, 1887
Creator: Foster, George W.
Partner: UNT Libraries Government Documents Department

Car Ventilator.

Description: Patent for a new and improved car-ventilator. This design consists in "an eduction pipe arranged lengthwise of the car" (lines 103-104). It further consists in a casing "at the end of the pipe, the fan-wheel mounted upon a shaft within said casing, [another] casing arranged adjacent to the [first] casing, a fan-wheel arranged within [a third] casing upon an extension of the shaft, and valves in the eduction pipe, to be opened and closed by the air" (lines 1-7).
Date: October 11, 1887
Creator: Tull, Francis Shalis
Partner: UNT Libraries Government Documents Department
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