A high degree of accuracy and sensitivity are obtained by using a combination of a two element vacuum tube and direct current galvenometer, which measures the voltage across the condenser in the resonant circuit instead of the current in the inductance as is the common practice. The small amount of energy necessary to operate this indicator makes possible a very sharp resonance peak. Its sensitivity allows it to be operated far enough from the source of the waves that it does not affect their length. A new method of locating nodes on Lecher's wires makes possible whatever accuracy can be obtained in measurement of a length. The wavemeter is calibrated, with the aid of these wires, for wavelengths between three and one hundred meters.
Proceedings of the Iowa Academy of Science
© Copyright 1926 by the Iowa Academy of Science, Inc.
"A New Type of Electromagnetic Wave Meter,"
Proceedings of the Iowa Academy of Science, 33(1), 240-240.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/59