File:Annual report 1921 (1921) (14581859500).jpg

Identifier: annualreport1921onta (find matches)
Title: Annual report 1921
Year: 1921 (1920s)
Authors: Ontario Hydro Hydro-Electric Power Commission of Ontario Ontario Hydro International Inc
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Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Guelph, University of Windsor, York University and University of Toronto Libraries

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at 10 amperes or other suitable ratings, so thatthey could at once be applied to fill an active demand. In fact, the call forsecond-hand meters has been of late such that they seldom find tfyeir way backto the storehouse shelves, but, on their delivery to stores, are immediatelypacked up and shipped out on waiting orders. In addition to the work doneon second-hand meters for stock, small shipments are being continually sent infrom municipalities for repair and adjustment, thus making possible a servicewhich in the course of a year saves many useful meters from the scrap heap. The work of checking and repairing indicating instruments, both thosebelonging to the Commission and to outside parties, has greatly increased, withthe result that an almost continuous stream of volt-meters, ammeters and watt-meters has flowed through the Instrument Shop and Standards Room. Ownersof metering devices are appreciating the advantages of having at hand a well- 1922 HYDRO-ELECTRIC POWER COMMISSION 273
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Corona Voltmeter Used to Measure Very High Voltages. It consists of a straightrod mounted concentrically within a metal cylinder, and enclosed in an airtighttank (shown at the left). The voltage to be measured is applied betweenthe rod and cylinder (which is grounded) and produces a corona dis-charge which is detected by means of a telephone. By varying the airpressure in the tank voltages up to 300,000 may be measured 2 74 FOURTEENTH ANNUAL REPORT OF THE No. 49 equipped and reliable institution which can not only adjust but make com-plete repairs on practically any type of instrument which comes to hand.Besides the instruments mentioned above, work has been done on a largenumber of meggers, instrument transformers, bond testers and special electricalmeasuring devices. The Commissions long-continued investigations upon the comparativetheoretical merits oi* the various methods of determining demand have been,for the present, concluded, and a summary of the findings was published inthe

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