. Comparative sensitiveness of some common detectors of electric oscillations . vanometer deflectionswith the thermoelement in circuit II and the intensity of signalsin the electrolytic in circuit III as measured by the shuntedtelephone This shows that the responses of the electro-lytic as indicated by the telephone are proportional to the squareof the oscillatory 6 A comparison was also made of the sensitiveness of the perikon without externalEMF and the electrolytic at the Washington Navy-Yard wireless station usingincoming signals from a distant station. The results agree
. Comparative sensitiveness of some common detectors of electric oscillations . vanometer deflectionswith the thermoelement in circuit II and the intensity of signalsin the electrolytic in circuit III as measured by the shuntedtelephone This shows that the responses of the electro-lytic as indicated by the telephone are proportional to the squareof the oscillatory 6 A comparison was also made of the sensitiveness of the perikon without externalEMF and the electrolytic at the Washington Navy-Yard wireless station usingincoming signals from a distant station. The results agreed within a few per centwith those found in the laboratory. 7 Very strong signals, i. e., more than about 300 times audibility, sometimes giveirregular results. 534 Bulletin of the Bureau of IIIElectrolytic Received Energy and Audibility of Signals [Vol. 6, No. 4. Thermoelement in Circuit IID Electrolytic in Circuit IIIA Ratio 12 36 40 140 41 250 40 324 41 645 38 Inductances, decrements, and wave length as in Table I. i¥34= Fig. 4 THE MAGNETIC DETECTOR. (Fig. 4) The circuits for the comparison of the magnetic and perikondetectors are shown in Fig. 2. The magnetic detector wasconnected directly in circuit II since it is usually used in theantenna. The magnetic detector used was of the ordinary Austin.] Detectors of Electrical Oscillations. 535 commercial type, the D. C. resistance of the oscillatory coilbeing ohms and the telephone coil 120 ohms. The telephonesfurnished with the magnetic detector and used in the experimentshad a resistance of 168 ohms. The telephones used with the peri-kon were of 1200 ohms resistance and medium sensitiveness. Forthe comparison of sensitiveness the variable coupling method wasused, the coupling L1 and L2 being changed until the signalsbecame inaudible. When the readings on the magnetic were beingtaken the circuit containing the perikon was removed, then forthe perikon readings the magnetic
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