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Automatic Train Stop

Description: Patent for an automatic train stop. Used to simplify the construction where fewer magnets and changeable switches are necessary. To provide an automatic train control mechanism with a normally closed circuit, the breakage or disarrangement of any part that would ensure the stopping of the train.
Date: May 21, 1918
Creator: Bulla, Melbern B.

Oven-Thermometer

Description: Patent for "an instrument for indicating the temperature of an oven, so that the fire may be regulated to secure the required temperature for any particular article" (lines 21-25).
Date: May 21, 1889
Creator: Voss, John C.

Torpedo-Guard.

Description: Patent for torpedo guards that can be applied without needing to place the vessel in a dry dock, as well as giving the option of retracting the torpedo guards when not needed. Includes illustrations.
Date: May 21, 1918
Creator: Rolf, Frederick G.
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