Word: signal
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Dates: during 1930-1939
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...trawling net equipped with a signal which indicates to fishermen when the net is full...
...diving signal came. Prien began spinning his controls. Air roared from opened ballast tank vents, water rushed in to take its place. On the control board-called "the Christmas tree" because of its numerous red and green lights-lights flashed, showing Prien that the air induction valves, which carried air to the engine rooms, were closed and watertight. Down planed the Squalus. As the depth gauge showed nearly 50 ft., she began to level...
...Pennsylvania R.R.'s tracks near Bradford, Ohio. An eastbound freight stopped at Bradford for coal. Another train, following too closely behind, rammed into it, flinging wreckage onto the adjoining track. On that track a fast fruit train, hauled by two locomotives, was booming along with an all-clear signal. It butted into the debris; a half-mile of cars slithered off the rails like a wounded snake. Three crew men were killed, four more badly hurt. It was the worst freight wreck the Pennsylvania had had on that division in 37 years...
...proved, in telecasting the six-day bike race at Manhattan's Madison Square Garden, that television could be transmitted over ordinary telephone wire. Engineers had considered coaxial cable, a copper wire threaded through separators inside a copper tube, the only practical ground conductor for the complex television signal. Since coaxial cable costs $5,000 a mile, prospects of a television network had seemed dim and distant...
...pressure is obtained by a pair of small aneroid bellows; the temperature, by a bimetallic strip which coils with change in temperature; and the humidity, by a single human hair. Each of the three instruments is fitted with a needle which touches a wire, sending out a radio signal by means of a micro-transmitting set. The significance of the signals depends on the time between them. The measurement of this time interval by the operators on the ground provides all the needed information...