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Also in each of these methods the efficiency of transmission is the product of three factors or partial efficiencies, which correspond exactly namely, first, the efficiency of the instrument which converts the actual energy of the prime mover into potential energy; second, the efficiency of the instrument which reconverts this potential energy into actual energy, that is, into motion, and delivers it up in this shape for the actual operations which accomplish industrial work; third, the efficiency of the intermediate agency which serves for the conveyance of potential energy from the first instrument to the second.
The filtrate and washings should always be carefully examined for minute quantities of the sulphate which may pass through the pores of the filter. Subsequent ignition, with ready access of air, reconverts the sulphide to sulphate unless a considerable reduction has occurred. PROCEDURE. Weigh out, into platinum crucibles, two portions of about 0.5 gram of the sulphate.
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