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)
es being insu-lated with gutta-percha cover-ings. As one of the charcoalpoints slowly wastes away,while the other is somewhatelongated, provision is made,by means of clock-work (notshown), for keeping the pointsproperly adjusted.An electrical light, furnished by a battery of 48 carbon… … 74-^. Figure 40.—The voltaic arch.—The figure representsthe charcoal points which are connected with the battery (746). Thecurved lines show the form of the arch of electrical flame, a white and
Physics · Astronomy
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