. Practical wireless telegraphy; a complete text book for students of radio communication . is dis-charging and that theclosed and open oscilla-tion circuits are in exactresonance; furthermore,that two positions on the variable condenser which _ . ■ , we may call C-1 and C-2 are tlTe points at which the wavemeter is m resonance with thedouble wave. Then, as the pointer of the variable condenser is moved from zero positiontoward C-1, the reading of the wattmeter increases, until the point, C-1, is passed, when adecrease takes place. An increase of current again takes place as C-2 is approached
. Practical wireless telegraphy; a complete text book for students of radio communication . is dis-charging and that theclosed and open oscilla-tion circuits are in exactresonance; furthermore,that two positions on the variable condenser which _ . ■ , we may call C-1 and C-2 are tlTe points at which the wavemeter is m resonance with thedouble wave. Then, as the pointer of the variable condenser is moved from zero positiontoward C-1, the reading of the wattmeter increases, until the point, C-1, is passed, when adecrease takes place. An increase of current again takes place as C-2 is approached fol-lowed by a decrease when the point of resonance is passed. If the wave-length of the wave-meter and the corresponding deflection of the hot wire wattmeter be observed over a seriesof wave-lengths, the data thus obtained may be plotted in the form of a resonance curve inthe following manner. (See Fig. 218). Placing in one column the wave-lengths corresponding to the condenser scale of the wave-meter, and in the second column the corresponding deflection of the hot wire wattmeter,. 6oa 700 WAVE LENGTHFig. 218—Resonance Curve of the Antenna Oscillations. 198 PRACTICAL WIRELESS TELEGRAPHY. co-ordinate points are laid off on cross-section paper through which a common line or curveis drawn. A typical set of readings follows: Wave-length of thewavemeter 450 495 525 535 540 560 575 585 600 615 625 635 655 700 Corresponding deflectionof the hot wire wattmeter With the cross-section paper before us, the wave-length readings are laid off horizontallyas indicated in Fig. 218 and are known as the abscissas of the points on the curve, while thehot wire wattmeter readings are laid off vertically and are known as the ordinates of thepoints on the curve. Take, for example, the wave-length of 575 meters; the corresponding
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
