M-1 Aiming Circle ~ ca. 1918
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Used for "laying the guns" the aiming circle is a key piece of equipment for pointing the guns in the direction of fire. The executive officer, normally a 1st Lt. places the aiming circle on a magnetic azimuth and gives an azimuth reading to the gunner. The gunner places the reading on the gun sight and moves the gun right or left until his crosshair comes back to the aiming circle. When the gunner and executive officer's readings are the same the guns are laid for direction. M1917 Rangefinder ~ ca. 1918. Artillery forward observers used this rangefinder to determine the distance to the target in World War I. Adjusting the elevation and the focus knobs, determines the range and relays it to the fire direction center. He then used the scales on his sight to determine the amount of adjustment required to bring the fire on the target. The rangefinder was made by Warner & Swanson Company of Cleveland, Ohio. The leather sling allows the forward observer to carry it on his shoulder or sling it over his back. M1915A1 Battery Commander's Telescope ~ ca. 1918. The "BC Scope" was used for observing and adjusting fire on to the target and measuring the horizontal and vertical angles in calculating firing data. The leather case below was used for protecting the telescope during transport.
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