of smokeless powder duties might require him to pass through the fires an 850-pound shell with a muzzle veloc- door or who might become imprisoned in a ity of 2,800 foot-seconds, and a muzzle energy compartment in case of accident. The pneu- of 46,246 foot tons. The true basis of com- matic and… … must be remembered are: (1) the mechan- A Horizontally Closing Door, Showing the Motor, Rack, Closing a Vertically-Operating Bunker Door that the modern elon- ism for controlling the Hand Controller and Hand Gear. by Hand Gear. gated shell will hold circuits running to its velocity much long- each…
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