ty; but the amount of blue necessary to the emerald green disk which just balances it and pro- counterpoise the system would be much greater, Fig. the sand is to hold the crystals in place. It plays no active part in the experiment. The crystals must not duces white light is 1'7, Fig. 4. 11. Green… … that in all these experiments, pidity of growth will next be observed. The iron in the course of a few hours the disks are compounded of two capable of slid- required to neutralize the others is a minimum, which will have sent up ife filaments several inches, while ing one above the other, so as to…
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