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)
nvey an erroneous idea, for it isemployed only as a convenient expression for an unknown cause. In-stead of assuming the existence of a separate fluid or ether, as amedium for light, heat, or magnetic electricity, it is more in accord-ance with sound philosophy to suppose that these separate… … 656. Figure 3.—Attraction and repulsion.—If two pith-balls be suspended, as shown in the figure, and both charged alike, thatFig. 3. is, with either positive or negative electricity, they will be mutuallyrepelled, as represented by thedotted balls and the signs plus andminus. But if one ball be…
Physics · Astronomy
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![An illustration from Original microscopic drawings made between the years 1824 and 1840 mostly published in works by Dr. Goring & A. Pritchard [graphic]. (1824)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b21301177-92-1.webp)
