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Ambulance planes
338
CURRENT TOI~ICS
[J. F. 1.
Sound Waves Photographed (Tele-Tech, Vol. 9, No. 8).mA new technic recently developed at the Bell Telephone Laboratories makes actual photographs of sound wave patterns possible. The method will be used for studying the sound waves from telephone receivers and similar communications equipmentl and for observing microwave radio wave patterns. Equipment used in this work consists of a tiny microphone and a neon lamp, mounted on a swinging beam which scans the wave field. As the beam moves through the field, a clear picture of the sound radiation is built up by scanning, similar to the way in which television images are formed. In one of the first experiments using the new technic, Bell scientists W. E. Kock and F. K. Harvey, who developed it, made photographs showing the precise acoustic effect of lenses. The lenses are similar to those used in microwave radio relay systems. The microphone used in taking the pictures of sound is about the size of a quarter. It is mounted on the end of an aluminum arm four feet long along with a tiny, 110-volt neon lamp. A small loudspeaker radiating a sound wave is directed at one side of the acoustic lens. On the other side of the lens, the metal arm swings up and down, inscribing a three-foot arc through the path of the sound waves as they emerge from the focusing lens. Sound picked up by the microphone is carried to an audio-amplifier. As the sound level varies, the brightness of the neon lamp varies in proportion. Viewed in a darkened room, the lamp glows brightly, then fades, then brightens again. As it traces its vertical pattern, it automatically moves horizontally away from the lens. Thus in a ten-minute time exposure, a sound wave pattern may be photographed• Ambulance Planes (American Aviation, Vol. 14, No. 6).--More than 350 ambulance aircraft are available to doctors and hospitals throughout the nation, according to the "mercy aircraft" list published by CAA. The planes range in size from Cubs remodeled to carry one stretcher through four-place aircraft capable of carrying two stretchers and on up to converted C-47's. The list gives the location and the operator's day and night phone numbers, type of plane, capacity to carry medical personnel and patients, and whether oxygen is available in flight. It is being sent to every county medical society so as to be within reach of the greatest number of doctors, and to a selected list of hospitals and clinics. Copies of this Directory of Ambulance Planes are available from CAA's Office of Aviation Information, Washington, D. C. A prefabricated cold-weather building of stressed skin aluminum, containing its own heating and sanitation facilities, is being tested by the Army's Engineer Research and Development Laboratories at Fort Belvoir, Va. Designed to withstand 100-mph winds and temperatures as low as - 6 5 ° F., it is made up of 8-ft. side, roof and floor panels with a honeycomb core, faced on both sides with an aluminum alloy. Primarily for troop use, the building has lightweight parts and is quickly erectable, even by relatively green troops.
CURRENT TOI~ICS
[J. F. 1.
Sound Waves Photographed (Tele-Tech, Vol. 9, No. 8).mA new technic recently developed at the Bell Telephone Laboratories makes actual photographs of sound wave patterns possible. The method will be used for studying the sound waves from telephone receivers and similar communications equipmentl and for observing microwave radio wave patterns. Equipment used in this work consists of a tiny microphone and a neon lamp, mounted on a swinging beam which scans the wave field. As the beam moves through the field, a clear picture of the sound radiation is built up by scanning, similar to the way in which television images are formed. In one of the first experiments using the new technic, Bell scientists W. E. Kock and F. K. Harvey, who developed it, made photographs showing the precise acoustic effect of lenses. The lenses are similar to those used in microwave radio relay systems. The microphone used in taking the pictures of sound is about the size of a quarter. It is mounted on the end of an aluminum arm four feet long along with a tiny, 110-volt neon lamp. A small loudspeaker radiating a sound wave is directed at one side of the acoustic lens. On the other side of the lens, the metal arm swings up and down, inscribing a three-foot arc through the path of the sound waves as they emerge from the focusing lens. Sound picked up by the microphone is carried to an audio-amplifier. As the sound level varies, the brightness of the neon lamp varies in proportion. Viewed in a darkened room, the lamp glows brightly, then fades, then brightens again. As it traces its vertical pattern, it automatically moves horizontally away from the lens. Thus in a ten-minute time exposure, a sound wave pattern may be photographed• Ambulance Planes (American Aviation, Vol. 14, No. 6).--More than 350 ambulance aircraft are available to doctors and hospitals throughout the nation, according to the "mercy aircraft" list published by CAA. The planes range in size from Cubs remodeled to carry one stretcher through four-place aircraft capable of carrying two stretchers and on up to converted C-47's. The list gives the location and the operator's day and night phone numbers, type of plane, capacity to carry medical personnel and patients, and whether oxygen is available in flight. It is being sent to every county medical society so as to be within reach of the greatest number of doctors, and to a selected list of hospitals and clinics. Copies of this Directory of Ambulance Planes are available from CAA's Office of Aviation Information, Washington, D. C. A prefabricated cold-weather building of stressed skin aluminum, containing its own heating and sanitation facilities, is being tested by the Army's Engineer Research and Development Laboratories at Fort Belvoir, Va. Designed to withstand 100-mph winds and temperatures as low as - 6 5 ° F., it is made up of 8-ft. side, roof and floor panels with a honeycomb core, faced on both sides with an aluminum alloy. Primarily for troop use, the building has lightweight parts and is quickly erectable, even by relatively green troops.