Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 421
ight shining through each. Cause the crystal to rotate in, aplane parallel with the card, and one of the holes will appear to remainnearly at rest, while the other revolves around the first. 1 This crystal, sometimes called calcite or calc-spar, is found most abtmdantly inIceland. It exhibits tlie… … Fig. 303. DOUBLE EBFRACTIOSr. 403
Physics
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