Word: quartzes
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...lamp is a stout, strongly sealed quartz tube less than a quarter-inch in outside diameter, with an inside diameter of .08 to .04 in. It contains neon to start an electric arc, is so full of mercury that when the arc vaporizes the mercury, the pressure rises as high as 300 atmospheres. At the core of the mercury the temperature is 14,000° F., on the inside wall of the tube 1,800°. The lamp is served by a water cooler in which the water must be hurried along in its jacket to prevent the formation...
...complete, A. T. & T. summoned newshawks to its downtown Manhattan offices for the cable's first public demonstration. The cable can transmit 240 telephone messages at once. The voices are reduced to radio frequencies and all poured on the cable at once, separated at the receiving end by quartz crystal wave filters. Last week an engineer in one room merely talked to a reporter in the adjoining room, but between speaker and hearer the message made 40 trips between Manhattan and Philadelphia (3,800 miles), the frequency being shifted to a different wave length after every round trip. Then...
...possible." For a moth-proofing company Ward's made up salesmen's display kit's showing the growth stages of moths and how they eat fabric. The research laboratories of General Electric and Westinghouse buy rare minerals. Amateur lapidaries order rough masses of aquamarine, rose quartz, agate...
Biologist Wells's Harvard experimental laboratory is a steel, glass-lined tank big as a dentist's operating room. Within is a mercury quartz lamp which emits ultraviolet light. The air within the tank Mr. Wells can make as pure or as germ-laden as he pleases...
...turns over about 2,000 times a minute, and one complete explosion lasts only 1/250th of a second. Of this brief performance the camera records 20 successive stages. The film runs continuously at crankshaft speed-up to 250 m. p. h. Light from the explosion passes through a heavy quartz window in the cylinder head to a stationary lens, thence to a series of 30 rapidly moving lenses which follow the film and hold each image motionless on it during exposure. The spark is seen first like a lone star in a black sky, then a flame front spreading...