This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
A gun which uses compressed air instead of gunpowder to drive out the bullet. There is a piston to force the air into a cavity, and a valve opened by the trigger, which lets the air out against the bullet. This is driven out with some force. Air guns are of little use.
 
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