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)
out furtherrubbing. If the plate be left in reposeon the resin, the apparatuswill remain charged even forweeks. And the Leyden jarmay be charged with the instrument at any time. If the disk, S, were raised from the resinous cake, W, without apply-ing the finger, as represented in Fig. 13, it would…
Physics · Astronomy
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