. Biographies of distinguished scientific men. Scientists; genealogy. EMISSION THEORY. 233 ago traces of the former in the writings of Empedocles. Among the moderns I can cite among its adherents, Kep- ler, Newton, and Laplace. The system of waves does not reckon less illustrious partisans; Aristotle, Descartes, Hooke, Huyghens, Euler, adopted it. Such names on either side render a choice difficult, if in a matter of sci- the reader to a very simple machine, represented in the annexed figure contrived by the translator, which exhibits a set of white balls, repre-. senting the molecules of ethe
. Biographies of distinguished scientific men. Scientists; genealogy. EMISSION THEORY. 233 ago traces of the former in the writings of Empedocles. Among the moderns I can cite among its adherents, Kep- ler, Newton, and Laplace. The system of waves does not reckon less illustrious partisans; Aristotle, Descartes, Hooke, Huyghens, Euler, adopted it. Such names on either side render a choice difficult, if in a matter of sci- the reader to a very simple machine, represented in the annexed figure contrived by the translator, which exhibits a set of white balls, repre-. senting the molecules of ether: these are attached to rods, which are moved on tui-ning the handle by cranks at their lower end, so arranged that each ball is in succession raised or lowered nearly in a straight line; so that they follow each other in the form of a wave. When the bar supporting the rings through which the rods pass, is lowered, the balls no longer move up and down in straight lines, but describe each a kind of oval curve, which becomes more rounded the lower the bar is placed. In the former case the machine represeuts a wave with plain vibrations, in the latter, with elliptic or circular Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Arago, F. (François), 1786-1853; Smyth, W. H. (William Henry), 1788-1865; Powell, Baden, 1796-1860; Grant, Robert, 1814-1892; Fairbairn, William, Sir, 1789-1874. Boston, Ticknor and Fields
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