. Practical wireless telegraphy; a complete text book for students of radio communication . Fig:. 191—Showing How the Inductance of the Radio Frequency Tuning Coil Can Be Varied by One Turn at a Time. 166 PRACTICAL WIRELESS cause the sliding contact soon cuts through the wire either actually breaking the turns or short circuiting adjacent turns. By the method shown in the diagram, Fig. 191, the inductance of a single layered coil can be progressively varied from one turn to the maximum number simply through the use of two multipoint switches doing away with the sliding contact. Fo
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig:. 191—Showing How the Inductance of the Radio Frequency Tuning Coil Can Be Varied by One Turn at a Time. 166 PRACTICAL WIRELESS cause the sliding contact soon cuts through the wire either actually breaking the turns or short circuiting adjacent turns. By the method shown in the diagram, Fig. 191, the inductance of a single layered coil can be progressively varied from one turn to the maximum number simply through the use of two multipoint switches doing away with the sliding contact. For purposes of illustration, assume a winding having 110 turns. Then the first 10 single turns are connected to the contact points of the switch S-2 and the remaining turns are connected in groups of 10 to the contact points of the switch S-1. An odd number of turns can be selected in the following manner:If 87 turns are required for resonance inany particular circuit, switch S-\ is setat the eightieth contact point and switchS-2 on contact point 7, making 87 com-plete turns. One turn of inductance, forinstance, can be selected by setting S-1at zero and S-2 at contact point 1. Thisis the method by which the prima
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
