grip to aid control and a standard rifle-style trigger. When mounted in fortifications, the twin-mount included an adjustable twin-shoulder stock, a tubular metal bar that extended from the rear of the mounting frame, which mounted a horizontal crossbar, with shoulder pads on each end. The operator would face the breeches of the guns and place these pads against his shoulders. He would then use his body to control traverse, while his hands would grip the pistols grips to fire one or both guns. Elevation was controlled by a brass crank underneath the weapon. Twin mountings came in T and F configurations; F types used standard triggers and stocks and were used for embrasure mounts in casemates and cupolas, while the T featured a trigger operated by Bowden cable and was intended for remote use in retractable turrets. The standard for a mle 1931 in fixed emplacements was a JM Reibel twin-mount, complete with telescopic sight, azimuth and level indicators, elevation screw and spent case ejection chutes. It was manned by a crew of eight, including two gunners, two loaders, two assistant loaders (to fetch ammunition and reload pan magazines with a table-mounted reloading machine that took standard 5-round stripper clips), a mechanic to repair any faults or jams, and a commander to direct or coordinate fire. The purpose of pairing the guns was to allow for sustained and rapid fire. During normal use, the two guns would be fired in turn, allowing the other gun time to cool down. When called for, both guns could be fired together, increasing instantaneous rate of fire. Charts were posted on the walls in each emplacement, outlining standard operating technique: normal fire was 150 rounds (one magazine) per minute, alternating between guns. Each gun would be fired for one minute, in bursts, until the magazine was empty. Then, the gunner would stop, and fire the second gun for a minute while the first gun cooled and was reloaded. Then the first gun could be used again. This rate of fire could be sustained for 3 minutes per gun, before the accumulated heat built to a dangerous level. Accelerated rate was 450 rounds per minute (3 magazines) per gun and was achieved in the same way as normal fire; the gunner would fire off three magazines within a minute and then stop before his barrel overheated, and then repeat with the second. Due to the