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<p>The author has already referred to the standardisation of the perikon detector, for the same conditions of frequency and coupling, by comparison with a thermo-element. He now makes use of this arrangement, a galvanometer of 2000 ohms' resistance and sensitiveness 1.28*10/sup -9/ amp being used with the dector. In the following table are given the received current and received energy, measured in this way for various sending stations, the measurements being made at the U.S. Naval Wireless Telegaphic Laboratory at Washington:- Sending station Rated power Wavelength Approx. deflection Perikon deflection Ratio perikon to thermo-element Received current Effective receiving resistance Received energy kW m miles mm *10/sup -6/ amps ohms *10/sup -8/ watts Philadelph
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<br>Subjects: radiotelegraphy/ B6210F Telegraphy</div>
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