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 626
ented about the only ones now in use are the crystal detectorand the vacuum-tube detector. Both these detectors act as ELECTROMAGNETIC WAVES 559 rectifying or valve devices, which have the property of pro-ducing a direct current when an alternating current or elec-trical oscillations are sent… … ^?- Fig. 413. — Vacuum tube used as audion detector. emits electrons which carry away part of the filament, causethe darkening of the bulb, and also render the vacuum a con-ductor in one direction only. In one type of vacuum valve, shown in figure 413, we have threeelements: the tungsten filament…
Electricity · Magnetism
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