The book of philosophical experiments, illustrating the principal facts and curious phenomena of electricity, galvanism, magnetism, optics, chemistry, heat, etc., with introductory observations of each science, and upwards of 300 experiments (1839)
Dalton, J. S. (John S.) · New York : [s.n.] · leaf 31
size of the objects at pleasure, byadjusting the tube, and standing near, or at a dis-tance from the cloth. Grotesque figures, ani-mals, &c, painted on glass slides, having theother parts covered with black varnish, to pre-vent the transmission of light, except throughthe figure, are generally… … DURATION OF IMPRESSIONS ON THE IlETINA—THECIRCLE OF IlKE. 231. It was formerly thought that these im-pressions disappeared from the retina the momentthe object that produced them was removed frombefore the eye; but this is found not to be thecase, for an impression—that is to say, a pic-ture in…
Physics
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