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Nevada United States 1936 stock footage and images
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Humorists including Jimmy Durante, Andy Devine and Robert Benchley perform 'Down by the Old Mill Stream' for American GIs.
A woman GI presents 'By Request' for the Army Navy Screen Magazine in the United States. An American soldier in China requests an old song. Character actors, humorists and comedians perform song "Down by the Old Mill Stream" on stage. Performers include Jimmy Durante, Allen Jenkins, Sterling Holloway, Hugh Herbert, William Gargan, Edward Brophy, Andy Devine, Allan Hale, Robert Benchley, and Arthur Treacher. The audience breaks into laughter during the performance. The female GI winds up the show after the performance. She states the program address and asks the soldiers to keep writing in. (World War II period).
Space research about the ionosphere from the ground by the National Bureau of Standards.
Film entitled 'Scatter Radar', from The National Bureau of Standards, United States Department of Commerce. Depicts space research from the ground. The globe rotating. A satellite antenna moves into position. Radio instruments. Red optical instruments used to study the sun. Clouds in the upper atmosphere. Animation: Ionosphere reflects radio waves to the planet. A smoke of cloud rises during the launching of a rocket. An artists' conception of the Van Allen Radiation Belt above the Earth's ionosphere discovered by Explorer I and Pioneer III. A satellite orbits the globe. Men watch as a rocket is erected and fired. A scientist at the National Bureau of Standards works on a formula. A man at the controls of a scatter radar fro space research. Animation: Ionized and neutral particles as well as free electrons that permit long distance communication. free electrons reflect radio energy. Radio waves penetrate the ionosphere. A scientist at the Ionosonde model C4 to measure electron density variations. Electron density model on the monitor. Two Oxygen atoms. An electron detaches and becomes a free electron. Radio waves pass by, the electron and waves oscillate and scatter energy. Animation: Need to excite electrons sufficiently so that their energy radiated can be detected from the ground. The process requires a powerful transmitter, large antenna, and a sensitive receiver.
Communication waves and the relation between power transmitted and received in Space Communications
United States Air Force training film about Space Communications and the related problems and developments. Animation: Planets, remotely controlled unmanned space research vehicles in space. Space communication links between the vehicles and Earth. Radio waves are reflected, refracted and absorbed. An antenna radiates waves that are dispersed. Communication and light waves on the frequency spectrum. Groundwave and Skywave transmission explained. Skywave transmission reflected back to Earth by the ionized layers in the Earth's upper atmosphere. Bouncing of signal in optimal conditions. Spacewave travels from transmitting to receiving antenna, and travels unaffected through the ionosphere into outer planetary space. Depicts laws that govern Line of Sight transmission: Relation between power transmitted and power received, and ideal and regular conditions. Explains the factors involved in the relation between the power transmitted and received. Comparison of communication and light waves. Inverse Square Law explained. The law applied to Space Communication: Signal generated from point source, energy dispersed in shape of sphere, energy spreads over expanding spherical area. Outlines a practical approach to strengthen received power: Directing the radiating energy, and enlarging area of the receiving antenna.
USAF pilot wearing MA-2 helmet in the cockpit of an aircraft in flight
U.S. Air Foce pilot in cockpit of aircraft wearing MA-2 helmet. The pilot in cockpit. Views of the helmet. Shell and faceplate of the helmet.
Troop transport, USS Elizabeth C. Stanton, AP-69, engaged in amphibious training exercises during World War II
United States soldiers and sailors participate in amphibious training exercise, in the Chesapeake Bay, during World War 2. Soldier and Sailors exit a Landing Craft Personnel Large, LCPL, and run across a beach towards some woods. Soldiers crouched aboard a Landing Craft Vehicle Personnel, LCVP, under way. Note many of the soldiers armed with M-1 Garand rifles, have applied condoms to the muzzles of their rifle barrels, to prevent salt water corrosion. The fleet transport USS Elizabeth C. Stanton, AP-69, flagship for amphibious exercises in Chesapeake Bay., at anchor. A Landing Craft Personnel Large, LCPL passes by in the foreground. Soldiers aboard and exiting a beached Landing Craft Vehicle Personnel, LCVP. An LCVP with 'P69-10' painted on its side hits the beach. Soldiers exit near yellow cloth beach signal panel and run across the beach.
A 75mm pack Howitzer carriage is lifted from hold of ship during a landing maneuvers exercise in World War II.
United States soldiers during a landing maneuvers exercise in World War 2. Soldiers look on as a 75mm pack Howitzer carriage is lifted from hold of ship by crane. Soldiers put on gear and disembark from the transport ship to a small Landing Craft Vehicle Personnel (LCVP). Soldiers crouch in the LCVP as it gets underway.
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