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)
700. Figure 26.—The electric spark.—The explanation ofYiQ, 26. ^ figure is contained in article 684. When a brass ball, at the endof a conducting-rod, is presented toa powerfully charged prime con-ductor, sparks are sometimes takenfrom it at a distance of thirty inches. … ELECTRICITY. 373 701. The color of the electric spark.—In air and oxygengas it is white; though in heavy thunder-storms of this country it issometimes purple, and at other times violet. In nitrogen it is blue;in hydrogen, crimson ; in carbonic acid gas, green. Fig. 27.
Physics · Astronomy
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