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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 367

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 367
e the resinous cake by vig-orously rubbing it with cats fur orwarm flannel, which developesnegative electricity in the resin.Then apply the disk, S, to theresin, as shown in Fig. 13, hold-ing it by the handle. The cakeof resin acts upon the disk by induction, drawing its positive fluid tothe… … ELECTRICITY 361 common reservoir (the earth, GOO). If the disk now be raised by itshandle from the resinous cake, and touched with the knuckle, asshown in Fig. 13, a spark will Fig. 13. pass, which is due to thenegative electricity passingfrom the body of the experi-menter to the positively…

Physics · Astronomy

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