by a ratchet when the while running through the tunnel. The track weighs The work at the Sandy Hook Proving Ground is by loading position is reached. The lower end of the 106 pounds to the yard. The current is conveyed by a no means confined to the mere test of the ballistic levers moves forward… … tion they carry carriage running on the wire re- practically t he ceives the current whole mass. and delivers it to a motor car by meauss of a cable and When the gun is loaded the ratchet holding the gun expended on the various gun-carriages that are sub- levers is released, the counterweight, due…
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