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 29
straight lines (sec introduction,)procure a straight flexible tube, and look throughit at any object, which will then be distinctlyvisible. If, however, one end of the tube be nowbent, either upwards or downwards, on lookinginto the tube, it will be found perfectly dark; thelight coming in at the… … LIGHT PRODUCED FROM QUARTZ STONES. 219. If two of these stones (milk stones, asboys sometimes call them) be struck against eachother, they will emit light; and if they are struckunder water, the same effect will be produced. TO OBTAIN A LIGHT FROM LOAF SUGAR. 220. If two large piects of loaf sugar…
Physics
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