Electrical news and engineering . n the peak is wonderfully satisfactory .ind in \iiymany towns has put off an extension of tin- foryears, while in the meantime it has imiiroved the power fac-tor materially and increased the output to such an extent as to very materially lower the costs of generation. The high-rate period is usually about two hours, butthis depends on the locality. The actual time duringwhich it applies will of course vary with the time of year,so as t(] follow the seasons alterations in peak many l(jcalities too it may be advisable to differentiatebetween week
Electrical news and engineering . n the peak is wonderfully satisfactory .ind in \iiymany towns has put off an extension of tin- foryears, while in the meantime it has imiiroved the power fac-tor materially and increased the output to such an extent as to very materially lower the costs of generation. The high-rate period is usually about two hours, butthis depends on the locality. The actual time duringwhich it applies will of course vary with the time of year,so as t(] follow the seasons alterations in peak many l(jcalities too it may be advisable to differentiatebetween week days and Sundays. As regards the instru-ments used for this work, I have not seen any two-ratemeters with iloul)le-(lials in .America but have seen instru-ments in which a resistance is inserted in the pressure cir-cuit during the day to cause the meter to run slower. Weused to have this method in England some years backbut it is very objectionable. A meter cannot be sloweddown to one-fourlli it, normal rate without seriously af-. fecting its starting current and accuracy, while the factthat an interference of some sort is taking place with theaccuracy makes the customer feel uneasy. On the other hand, the advantages of the nietliud il-lustrated of using two sets of dials are almost too obviousto need mention. In such an arrangement the changeoverfrom one set of dials to another is effected by a solenoid,I lie coil of which is connected across the mains and opened,111(1 closed by a time switch. This time switch was foryears the bugbear of the two-rate system, but with a real-ization on the part of the manufacturer that a cheap clock wasno good for this work and that the switchgcar must be ofthe simplest description, this difficulty has vanished. Thegreat improvement that has been effected is shown bythe fact that the British Hoard of Trade has oflicially ap-l)roved a swiuh fnr llii-. work. ;ifter refusing for years toconsider any of llie instruments on the market. Such aninstni
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidelectricalnewsen20donm
