points of advan- construction resulted, especially the evolution of the of requisite quality could be obtained readily, so that tage the Weston cell with its.E.M. F. of 1.1025 volts H-type containing vessel and the substitution of zinc both types of cells are reproducible to within 2 or 3… … Fig. 4.—Cells, showing traveling contacts fig. 6.—Laboratory tor studying siandard cells. and method of meanting. THE STANDARD ELECTBICAL CELL—ITS USE AND ITS PBACTICAL VALUE.
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