. Practical wireless telegraphy; a complete text book for students of radio communication . CAR60RUNDUM/CRYSTAL STEtL CONTACT POINT Fig. 158—Carborundum Detector Complete. 140 PRACTICAL WIRELESS 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 importantthat the local current flow in a certain direction and that its strength be carefully
. Practical wireless telegraphy; a complete text book for students of radio communication . CAR60RUNDUM/CRYSTAL STEtL CONTACT POINT Fig. 158—Carborundum Detector Complete. 140 PRACTICAL WIRELESS 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 importantthat the local current flow in a certain direction and that its strength be carefully means in practice that either the connections to the battery must be reversed, or thecrystal must be turned about in the holder and left at the position in which the loudestsignals are obtained from a given sending station. The potentiometer, of course, must beadjusted simultaneously. The circuit of Fig. 153-b is suitable for the zincite-bornite detector provided a fixedresistance of about 2,000 ohms is connected in series with the battery B-1 and the poten-tiometer P-L Certain crystals of thisBORNITE /ZINCITE combination respond better with a local battery while others do not requir
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
