The parts used in this cannon are as follows: (1) 3' length of 3" diameter pressure rated PVC pipe (1) 3'2" length of 2" diameter pressure rated PVC pipe (1) 1/2" PVC ball valve (the cannon may ...
Speaking tubes, once standard issue on naval vessels as a guaranteed way to send messages without relying on power, were important enough that in 1926 the Navy's Bureau of Construction and Repair ...
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