. Practical wireless telegraphy; a complete text book for students of radio communication . 46 PRACTICAL WIRELESS following manner: A wire, E, F, is attached to the center of C, D, and a silk threadattached to it at K, which is wound about the shaft in such a way as to work againstthe tension of the spring S which, normally, would cause the pointer to move to thefull scale position. However, by means of the thread, it is drawn to the zero positionof the scale. When current is flowing through C, D, the expansion of the wire releases the pull of the thread which allows thepointer to
. Practical wireless telegraphy; a complete text book for students of radio communication . 46 PRACTICAL WIRELESS following manner: A wire, E, F, is attached to the center of C, D, and a silk threadattached to it at K, which is wound about the shaft in such a way as to work againstthe tension of the spring S which, normally, would cause the pointer to move to thefull scale position. However, by means of the thread, it is drawn to the zero positionof the scale. When current is flowing through C, D, the expansion of the wire releases the pull of the thread which allows thepointer to move across the scale ac-cording to the degree of expansion andthe tension of the spring. The fundamental principle of anotherinstrument for measuring radio-frequencycurrents, used by the Marconi Company,is shown in Fig. 55. The complete detailsfor construction are not opened for pub-lication, but briefly, the operation is asfollows: The current of radio-frequencyflows through several wires stretched be-tween blocks B and B*. A thermo-couple mounted on one of these wiresas indicated at C, D, is heated by thecurrent of r
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
