Letters of Euler to a German Princess, on Different Subjects in Physics and Philosophy, Volume 2Murray and Highley, J. Cutrell, Vernor and Hood, Longman and Rees, Wynn and Scholey, G. Cawthorn, J. Harding, and J. Mawman, 1802 - Science |
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accordingly agitation angle aperture apparent magnitude appear arch axis become Berlin burning-glass centre circle colour compound concave concave lens consequently contains convex lens defect degree denominated direction divisibility in insinitum earth effect elasticity electricity employed equal equator ether extremity fame thing farther focal distance focus glass globe greater Greek harpsichord Hence horizon human voice idea illusion inches insinite insinity iron ject Latin latitude lenses less LETTER likewise loadstone longitude Magdeburg magnetic declination magnetic matter magnetic needle magnifying power magnisies magnitude meridian microscope moon motion nature nearer objective lens observed ocular lens particles pass phenomena philosophers plate pole pores produce radius rays of light reason refraction remark rendered represented respect sigure sirst smaller space of diffusion species straight line subtile matter sufficient surface surprizing system of monads telescope tion tricity tube vibrations visual angle vortex
Popular passages
Page 30 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Page 29 - You know that extension is the proper object of geometry, which considers bodies only in so far as they are extended, abstractedly from impenetrability and inertia ; the object of geometry, therefore, is a notion much more general than that of body, as it comprehends, not only bodies, but all things simply extended, without impenetrability, if any such there be. Hence it follows that all the properties deduced in geometry from the notion of extension must likewise take place in bodies, inasmuch as...