. Journal of electricity. e of the fre-quency is incomparably greater by the master clockmethod. Fig. 3 shows in the upper curve the aver-age daily value of the frequency of the Boston Edisonsystem from Sept. 15th to Oct. 15th, 1916, duringwhich time regulation was by means of ordinaryfrequency meters. The lower curve which is on thescale contains no visible departure from a straighthorizontal line. This shows the daily average fre-quency of the same system during March, 1917,when a master clock was in use. The error in thedaily average value by the former method frequentlyran over one-half of
. Journal of electricity. e of the fre-quency is incomparably greater by the master clockmethod. Fig. 3 shows in the upper curve the aver-age daily value of the frequency of the Boston Edisonsystem from Sept. 15th to Oct. 15th, 1916, duringwhich time regulation was by means of ordinaryfrequency meters. The lower curve which is on thescale contains no visible departure from a straighthorizontal line. This shows the daily average fre-quency of the same system during March, 1917,when a master clock was in use. The error in thedaily average value by the former method frequentlyran over one-half of one per cent, and was veryirregular, depending upon the temperature. Theerror in the daily average value by the new methodis seldom greater than one five-hundredth of oneper cent, and is wholly independent of the tempera-ture. The result of this remarkable precision is not JMILYAVE/f/IGE ED/SON rffEQUEA/CY BEEOffE \1TE/fCLICK. 13,800 volt an ci//t a U»Sl//f£M, wts ro/f ^LECTA C/UUM WA77A/6 OF BOSTON, M/ISS. CO ^ 60 \ i 6 .5te CYCi D/I/LY,ES, WEff/IGi. E/TEQUE, vcY/trr£ f/NSTM LING MA ITEffCLt 1CK -:5% 15 EEB SO Z5 M/lff 2 1317 BEFORE AND AFTER The effect of the installation of a master clock is here strikingly illus-trated. Note the marked irregularities with the best regulation possibleunder the old system. only of benefit to a power company and its customersby reducing losses and improving the service, but italso adds a new kind of value to the service- Any-where on the system it is possible to connect a clockdriven by the same kind of self-starting synchronousmotor that is used in the master clock. These motor-driven clocks will tell time continuously with thegreatest accuracy, and it seems probable that theywill ultimately become as common as telephones orany other electrical necessity. RADIO STATION FOR HONGKONG OBSERV-ATORY A receiving installation for the radio station,Royal Observatory, Hongkong, is now being con-structed. The station is located at the
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