Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 237
or salmon color. Thissystem was invented by O. McFarlan Moore and was intro-duced commercially in 1903. The illuminant, as in Fig. 276,consists of a glass tube of any length up to 200 feet and i|inch in diameter of any desired form. The tube may bemade up in the form of letters as for a sign, or it… … the ends of the tube, which is filled with air, nitrogen, car-bon dioxide, or any other suitable gas. The tube contain-ing the gas is then exhausted to a pressure of about -^-^ mm.of mercury. As the tube operates likeall vacuum tubes, the vacuum becomesmore and more perfect, altering theefficiency…
Electricity · Electrical engineering
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