Electrical news and engineering . Figure No. 1—Starting Position. Figure No. 2—Running Position. Figure No. 3— An Automatic Float Switch Oft Position Switchboard Frequency Meters A new type of frequency meter has been recentlyplaced on the market by the Weston Electrical InstrumentCompany. This meter is of a new type, consisting of aspecial soft-iron instrurnent connected into a Wheatstonebridge arrangement of resistors and reactors. The instru-inent itself consists of an iron needle mounted in a mag-netic field produced by two flat coils arranged at right. angles to each oihit I he needle has
Electrical news and engineering . Figure No. 1—Starting Position. Figure No. 2—Running Position. Figure No. 3— An Automatic Float Switch Oft Position Switchboard Frequency Meters A new type of frequency meter has been recentlyplaced on the market by the Weston Electrical InstrumentCompany. This meter is of a new type, consisting of aspecial soft-iron instrurnent connected into a Wheatstonebridge arrangement of resistors and reactors. The instru-inent itself consists of an iron needle mounted in a mag-netic field produced by two flat coils arranged at right. angles to each oihit I he needle has no sl)ring control. l>ut i> perfectly free to align itself with the space positionof the resultant field of the two coils. The connections are shown. Thf 1>ridge is made u])of two reactors, two resistors and the field coils of the in-strument. One side consists of a reactor, the two coils ofthe instrument and a resistor, while the other side consistsof a resistor and a reactor. The points lietween the coils onone side and between the reactor ;ind the resistor on theother side arc connected together. Jhis meter has an extremely light mmable systemand is equipped with a highly efficient damper; therefore,it is capable of following accurately all fluctuation- in fre-quency. The indications are practically independent ofchanges in voltages and wave form. For instance, a varia-tion in from ; to volts produces an error ofonly i/i per cent.
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