The Cambridge Scientific Instrument Co., LTD. · Cambridge University Press · leaf 30
7 *, 109 * and 112* per 25 5 0 1.20 c Humective No. /. These sheets are ruled for a drum rotating in 12 hours and are suitable for instrument 108 a* per 100 8 6 2.00 c Herdman, 115 t. Two-Cell Accumulator in a case, especially suitable for use with Callendar Recorders ; capacity, 90 ampere-hours.… … Fig. 19. Fig. 20. Accumulator-charging resistance. Pocket Voltmeter. 116 t. Accumulator-Charging Resistance. For re charging a small number of accumulators from a direct current lighting or power circuit the most convenient apparatus is a lamp resistance. Fig. 19 illustrates the charging board we…
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