U.S. Patent Specifications

Abstract

In an automatic internal combustion engine fire protective system, the combination with the engine of an indicator operable by the continuous flow of a fluid, means on the engine to maintain a degree of pressure different from atmospheric pressure during the time of operation of the engine, a normally closed fluid system including the indicator and the pressure maintaining means, and means for opening the fluid system to the atmosphere upon the outbreak of fire, said indicator comprising a body member formed with a chamber, inlet and outlet connections for connecting said chamber in said normally closed fluid system and for permitting a flow of fluid through the chamber, a movable element in said chamber adapted to remain normally motionless but to move continuously upon the creation of a flow of fluid through the chamber, and a sight opening for permitting observation of the movable element in either its motionless or its moving condition.

Citation

(1936), "U.S. Patent Specifications", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 5, pp. 146-146. https://doi.org/10.1108/eb030051