Refine Your Search

Wheelus air base Tripoli Libya 1954 stock footage and images

- Showing 10615 to 10620 of 11186 results
Technicians use various machines to measure properties of knitted fabric.

Domestic science research work by the Bureau of Human Nutrition and Home Economics Service (United States Department of Agriculture). Chief of the Bureau Dr. Hazel K Stiebeling talks about research in the field of textile and clothing. A man brings samples of knitted fabric to women working at a table. A woman lays the samples out. A technician uses a machine to test the fabric for elastic recovery, breaking strength, air permeability, moisture absorption. She tests stretch and comeback by applying tension with weights. A machine used to show how much rubbing a fabric can stand.

Location: United States USA
Date: 1948
Duration: 59 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675031183
Dr. Kenneth Bowles and his team of scientists work at the Jicamarca Observatory near Lima, Peru.

Space research from the ground with a Scatter Radar. Completed construction at the Jicamarca Observatory near Lima, Peru. Hills in the background. Engineers and technicians inside the Observatory. Local Peruvians with technical skills are trained in class. A technician inspects the Observatory transformers. Men make final wiring check in the Condenser Bank. Two men work on an amplifier in the Amplifier Room. Technicians work at pumps and heat exchangers for the water purification and cooling system. Men work with blowers that circulate cool air throughout passage ways in tunnels. Cables and piping in the tunnels. Scientists direct transmitter energy into the antenna. They monitor every function of the operation. Coaxial aluminum piping conducts transmitted and received radio signals through a spark gap and mixer. A man operates the system outside. Energy for the radio signals flows through coaxial piping in trenches. Dipoles in a modular section of the antenna to probe the upper atmosphere in order to measure electron densities. Open wire lines connect two rows of elements. Dr. Kenneth Bowles conducts scientific observation in the Screen Room. He measures the electron density with a transmitter, holds a record of the trace of electron densities. Electron density observations on a monitor. Antenna at the Observatory, hills in the background. A globe rotates.

Location: Peru
Date: 1963
Duration: 7 min 5 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675031241
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.

Location: United States USA
Date: 1960
Duration: 6 min 41 sec
Sound: Yes
Color: Color
Clip Type: Edited
Language: English
Clip: 65675031242
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.

Location: United States USA
Date: 1956
Duration: 3 min 0 sec
Sound: No
Color: Color
Clip Type: Unedited
Language: None
Clip: 65675031249
A barrage balloon tethered with cables in flight, United States.

A white and orange barrage balloon in the sky at the Mobile Test Station of the Air Force Flight Dynamics Laboratory in New Mexico. The balloon tethered with metal cables. The barrage balloon in flight.

Location: New Mexico United States USA
Date: 1978
Duration: 30 sec
Sound: No
Color: Color
Clip Type: Unedited
Language: None
Clip: 65675031250
A technician weighs samples of a powdered material and fills it into an apparatus during an experiment.

Laser induced lightning experiments conducted by Electromagnetics Hazards Group at the Air Force Flight Dynamics Laboratory Mobile Test Station on Mt. Baldy, Colfax County, New Mexico. A technician weighs samples of a powdered material on a weighing scale. He fills the measured powder into an apparatus. He then seals the apparatus and begins the experiment.

Location: New Mexico United States USA
Date: 1978
Duration: 1 min 23 sec
Sound: No
Color: Color
Clip Type: Unedited
Language: None
Clip: 65675031265
<< Previous | Page: 1 ... 1770 1771 1772 ... 1865 | Next >>