A U.S. soldier throws two exploding incendiary hand grenades during tests in the United States in World War 1. . Closeup of an incendiary canister. The tester (unseen) taps the fuse end of the canister and lays it down on a rough corrugated surface. It smokes before exploding and creating an intense flame that melts the canister. Molten remains of the device.
An American soldier is shown, among buildings at a military base, kneeling beside a rifle set on a stand for test firing into an earthen berm nearby. He places a round into the chamber and closes the bolt. He then opens the bolt and retrieves the round (which slips from his hand and drops to the ground). Next, two different size rounds of ammunition are shown.
U.S. Army testing of weapons during World War 1. An American soldier fires a Browning M1917A1 .30-caliber Water-Cooled Machine Gun while sitting in a hard wooden chair on a porch. Two soldiers test firing a French M1914 Hotchkiss machine gun. Another soldier test fires a Vickers Mark I water-cooled machine gun.
An American soldier, at a U.S. Army base in World War 1, displays a Lewis machine gun without a shroud. He holds it at various angles for the camera. Next, a soldier is seen test firing the Lewis gun set up on an improvised wooden stand in an open field. View from beside the soldier as he fires the gun. Another view from behind him as he fires downward into a ravine.
American Army airmen are seen working on an American-built De Havilland DH-4 aircraft ("Liberty Plane") in a hangar, during World War 1. One airman picks up a Marlin M1918 machine gun from the ground and holds it up for the camera to photograph from various angles. He then hands the gun to two other airmen in the DH-4 cockpit, who install it next to one already in place. The scene also clearly shows the American 400 HP V-12 Liberty engine installed in the plane (cover has been removed). Next, an airman is seen in the observer (gunner) position in the rear of the airplane. He is installing a Lewis machine gun in the Scarff ring of the plane. He checks the ability of the gun to vary its elevation in the Scarff ring.
American airman standing in observer's cockpit of a De Havilland DH-4 aircraft, during World War 1, demonstrates the flexibility of twin Lewis machine guns installed on a Scarff ring. He rotates the twin guns through various angles and elevations as he moves up and down, himself, in the open cockpit. He then turns his attention to a single Lewis gun mounted atop the upper wing. He removes the gun's ammunition cannister and replaces it with another.
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