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50 per cent additional coil additional fee equal additional frequency additional instrument additional point additional temperature additional wave form ALTERNATING CURRENT approved design approximately sine wave Calibration at five calibration at three calibration by means charged one-half coefficient the extra corrections at five currents exceeding direct and alternating direct currents direct electromotive force Ditto ELECTRICAL RESISTIVITY exceeding 1,000 amperes Exceeding 1,000 volts exceeding 100 kilowatts exceeding 25 kilowatts Exceeding 300 volts exceeding 500 amperes extra fee extra points charged five points FREQUENCY METERS I.—DIRECT-CURRENT II.—ALTERNATING-CURRENT instruments which admit kilowatts the charge means of direct number of Clark ohm standards Physikalisch-Technische Reichsanstalt points the additional potentiometers RATIO COILS received for verification RESISTANCE APPARATUS resistance material Resistance of specimen RESISTANCE STANDARDS resistivity and conductivity sine wave form temperature $1.50 temperature coefficient three temperatures triple scale instruments unless otherwise ordered voltage VOLTMETERS AND MILLIVOLTMETERS WATT-HOUR METERS wave forms 1.50 Weston cells WHEATSTONE BRIDGES