Service Handbook Of The 75 Mm Gun Materiel Model Of 1916 PDF Download

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...trunnion and keyed in place by lug on sight lever and groove in trunnion. Socket is provided with dovetail slot at top to carry peep or panoramic sight. Socket is carried by two fulcrum-block pins, which screw into sides of socket and project inside socket frame to form a bearing for two arms of fulcrum block. The other two arms of fulcrum block bear on a pin which is attached to sight-bracket slide. A vertical lug at bottom of socket fits in socket slide, which has an arc-shaped surface bearing in sight bracket. Inside bearing surface is a worm thread meshing with leveling screw mounted in sight bracket, provided with a turning knob and held in place by collar turned on one end and pin and collar on other end. Cross level is mounted in socket near leveling screw. A plunger stud is pinned in socket at top of sight bracket and has plunger pinned to it. Spring is assembled around plunger stud and bears against plunger, compressing it against lug at top of sight bracket. Plunger automatically takes up lost motion in mechanism. A clamp screw with ratchet and detent are mounted in socket to hold shank of peep or panoramic sight. Clamp screw binds sight shank, and detent engages teeth in inside of ratchet, which acts as turning handle for clamp screw. The peep sight consists of front sight (peep sight) and rear sight (cross wires) mounted in peep-sight support, which fits in socket. Peep sight is supported on peep-sight guide, which is screwed and riveted to rear of peep-sight support and is actuated by peep-sight screw, which bears in peep-sight support and is provided with turning knob graduated in mils. A scale graduated in divisions of 10 mils is screwed to front of guide. Cross wires are mounted in crosswire holder at front of sight...