Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . may swing a1)out the muzzle, as a pivot,when the gun is in battery, so that a port-hole aboutthe size of the muzzle may be sufRcient. In the tigure, the chassis and carriage are movedby revolution of the crank-shaft 6. To elevate ordepress the breech, the hollow screw-collar ?rt onthe shaft d is thrown into gear, and by lever connec-tion the breech is swung upwa
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . may swing a1)out the muzzle, as a pivot,when the gun is in battery, so that a port-hole aboutthe size of the muzzle may be sufRcient. In the tigure, the chassis and carriage are movedby revolution of the crank-shaft 6. To elevate ordepress the breech, the hollow screw-collar ?rt onthe shaft d is thrown into gear, and by lever connec-tion the breech is swung upwanl. The collar ?«. is leftout of gear, and tin; chassis and carriage swung side-wise, still retaining tlie muzzle as a pivotal point. Winan^s Plan for oj)erating Ordnance. chassis, the whole being raised and lowered by steam-power, and also supported on hydrostatic cylindersD D, which control the descent of the platform andits carriage. Sliding hatchways are opened and closedby the raising and lowering of the gun-platfomi. Thevessel has no port-holes, and the gun Ais lifted abovethe bulwarks when it is to be fired. Moncrietfs counterpoise-carriage elevates the gunabove its parapet by the weight of the front part of Fig. Eads^s Ordnance-Operator {Minimum Port-Hole). the cheeks. The up-per and forward )iavtof the carriageis madevery heavy, and rocksin its seat when thegu» recoils. SeeGuN-C.\Itl!IAGE. o is the shield through which the port-hole is made. | Fig. 3413 shows a mode of operating heavy guns,Winans mode of loading guns on gunboats is I invented by Mr. Perley of New York. The weight
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