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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 380

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 380
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. … Fig. 28. 702. Figure 27.—Diflfer-ence between the positiveand negative spark.—Tlie posi-tive electricity gives an openingsheaf or brush of light; negativeelectricity gives only a star, as rep-resented in the figure. 703. Figure 28.—The electrical square.—The electricalsquare consists of a square…

Physics · Astronomy

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