. Comparative sensitiveness of some common detectors of electric oscillations . ental comparisons of the sensitiveness ofwireless detectors are described. SYMBOLS D = Galvanometer deflection] In general proportional to A = Telephone audibility energy in detector. / = Oscillatory current. c = Direct current. 527 52S Bulletin of the Bureau of Standards. [Vol. 6, No. 4. R = Direct current = High frequency , etc. = , etc. = Tuning condensers. K = Large fixed condenser = Mutual inductance between coils 3 and = Distance between coils
. Comparative sensitiveness of some common detectors of electric oscillations . ental comparisons of the sensitiveness ofwireless detectors are described. SYMBOLS D = Galvanometer deflection] In general proportional to A = Telephone audibility energy in detector. / = Oscillatory current. c = Direct current. 527 52S Bulletin of the Bureau of Standards. [Vol. 6, No. 4. R = Direct current = High frequency , etc. = , etc. = Tuning condensers. K = Large fixed condenser = Mutual inductance between coils 3 and = Distance between coils 1 and = Logarithmic decrement in circuit = Wave length. METHOD OF EXPERIMENT The exciting circuit1 in all the experiments is shown in Fig. B is a buzzer run by two storage cells with considerableresistance in series. The oscillatory circuit consists of a variableair condenser C1 having a maximum capacity of microfarads,and for moderate wave lengths an inductance Lx of milli-henries. These are connected directly across the contact of thebuzzer. Si=. mm Fig. 1 The action of the circuit is as follows: When the buzzer contactis broken, the condenser C1 is charged and this charge is retaineduntil the contact is again closed, when the condenser dischargesthrough the contact, producing oscillations in the circuit these oscillations take place in a closed metallic circuit, theyare very feebly damped unless extra resistance is introduced at R. All buzzers are not equally suited to producing oscillations bythis method. In some, considerable adjustment of the contact isrequired before sharp tuning is obtained. The buzzer used in 1 Other forms of buzzer circuit such as are used in several well-known types of wavemeters were also tried, but with the buzzer used they gave less powerful oscillationsthan the one here shown. Austin.] Detectors of Electrical Oscillations. 529 these experiments was of the 1905 United States Signal Corps type,and gave very satis
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