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Excerpt from Handbook of the 4. 7 Inch Gun Materiel, Model of 1906: With Instructions for Its Care The breechblock is of the interrupted-screw type, and is provided with four threaded and four slotted sectors. The front end of the axial recess In the block for the hub of the block carrier is closed by a bushing. Three vent holes leading from a cavity in the bushing to the rear through the breechblock permit the escape of gas from a ruptured primer. On a semicircular boss on the rear face of the breechblock are cut gear teeth, in which the gear teeth of the Operat ing lever bevel gear mesh. The upper end of the circular boss on which the gear teeth are cut serves as a stop to limit the rotation of the block in the unlocked position. This upper end of the circular boss comes in contact with a hardened steel stop riveted to the inner face of the block carrier. A radial lug or tooth projects from the inner surface of the breechblock and engages an L-shaped slot cut in the hub of the block carrier, so that when the mechanism is unlocked no relative movement between the breechblock and the block carrier can take place. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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