An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 617
.A more recent and far more sensitive detector is the vacuum detector. This was invented by Fleming and has been adapted to use with a telephone. It consists of an electric-lamp bulb pumped to a high degree of exhaustion with a tungsten filament F made incandescent by the current from a battery.… … Fig. 402. — Connections for Flemingsvacuum detector. ELECTROMAGNETIC WAVES, 551 A fixed condenser C\ bridges the telephone, and a variablecondenser C2 is joined across the receiving circuit. When the filament is brought to a state of incandescenceby the battery, electrons are sent off and the…
Electricity · Magnetism
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