Word: sonic
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Dates: during 1920-1929
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This inference was confirmed by ships which are repairing the quake-broken trans-Atlantic cables. Their sonic soundings showed that the ocean floor had moved and shifted the fishing banks. Because of broken cables and congestion of the unimpaired ones it was quicker last week to send many messages from London to Montreal eastward-via India, Australia, Fanning Island, Vancouver...
...ground of a particular field, in this case Mitchel Field, the plane was at all times. Because the action of this altimeter depends upon barometric pressure, a variable factor, a ground crew was obliged to radiophone Lieut. Doolittle air pressure conditions. In development are more independent instruments, the sonic altimeter by Dr. Elmer Sperry and the radio altimeter by General Electric Co. They will sensitively record the time and therefore the distance which a sound or radio impulse travels from a plane to the ground and back...
...flying will have more effect on future air transportation than anything else. For landing we will, I think, be able to use intersecting radio beams, sonic altimeters and other instruments...