Niaudet, Alfred, 1835-1883. [from old catalog], Fishback, L. M., [from old catalog] tr · New York, J. Wiley & sons · leaf 147
n than in the other model,and cannot escape the most rapid glance. 3. In these branch offices the battery is rarely made to * A Siemens unit is equal to the resistance offered by one metre ofmercury whose sectional area is one millimetre. 128 TWO-LIQUID BATTEKIES. work simultaneously upon several… … Fig. 32. in the railway and state telegraph services of Russia, al-most to the exclusion of all others. The batteries are generally left one year without care,in some instances fourteen months. But in offices wherethere is a very active service, the sulphate of copper isrenewed every four or six…
Electric batteries
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