Excerpt from Instructions for Mounting, Using and Caring for Barbette Carriage, Model of 1917 for 12-Inch Gun, Model of 1895 M1<br/><br/>Emplacement (plate I). — The emplacements for these carriages are constructed entirely of concrete with a low parapet and permit of 360° traverse. Thirty-six foundation bolts for holding the base ring are set in the concrete when it is laid, and 12 depressions are made for thrust plates. The carriage (plates II, III, and IV). — The carriage is of the Barbette type, mounting a 12-inch gun, model 1895 M — 1. The action of the carriage is as follows. Upon firing, the gun travels to the rear 30 inches In recoil In the cradle, carrying with it the piston in the cylinder. A portion of the energy of recoil sufficient to return the gun to its firing position is absorbed by the counterrecoil springs. The return of the gun to the firing position is eased by the action of the counterrecoil buffer....
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