Image from page 488 of "Practical physics" (1922)
Title: Practical physics
Publisher: Boston : Ginn and Co.
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library
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Text Appearing Before Image:
Cinematograph Film of a Bdllet fired through a Soap Bubble The flight of the missile may be followed easily. It will be seen that the bubble breaks, not when the bullet enters, but when it emerges. (From Moving Pictures, by F. A. Talbot. Courtesy of J. B. Lippincott Company)
Text Appearing After Image:
ELECTRICAL EADIATIONS 425 condenser C^ is brought into use, the loading coil not being utilized.^The oscillations in the aerial circuit of the receiving station induceexactly similar ones in the detector circuit, which is tuned to resonancewith the receiving aerial by means of L^, B„, and Cg. The so-calleddetector of these oscillations may be simply a crystal of galena D inseries with the telephone receivers R. This crystal, like the tungarrectifier of § 374, has the property of transmitting a current in onedirection only.- Were it not for this property the telephone could notbe used as a detector, because its diaphragm cannot vibrate with a fre-quency of the order of a million; and even if it could, it would producesound waves far above the limit ofhearing. Because of this rectifyingproperty of the crystal the receiverdiaphragm is drawn in only oncewhile the oscillations produced by agiven wave train last, this effect beingdue to the rectified pulsating currentwhich passes in one
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