Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 151
CAR60RUNDUM/CRYSTAL STEtL CONTACT POINT Fig. 158—Carborundum Detector Complete. 140 PRACTICAL WIRELESS TELEGRAPHY. … 159—The Zincite Bornite Detector. borundum crystals as a whole require greater pressure at the opposing contact than crystalsof galena, silicon, etc., although certain crystals under observation have required exceed-ingly light contact pressure. With all crystals employing a local battery, it is…
Telegraph, Wireless
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
