Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 141
sing suddenly a strained condition. The same appliesto the noise said sometimes to be heard at the instant of aflash of lightning. CHAPTER IV ELECTRICAL MACHINES. 88. The Cylinder Machine.—There are two classes ofelectrical machines; that is, machines by which large quantitiesof electricity at high… … Fig. 82. The simplest form of friction machine is that known as thecylinder machine (Fig. 82). It consists of a cylinder of glass(jB) fitted in a frame which allows it to rotate about a spindlerunning along its axis. The extremity of one horizontal 122 chap, iv.] Electrical Machines. 123 diameter…
Electricity
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