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Scientific American, Vol. 34, No. 13 (1876) (1876)

leaf 3

An illustration from Scientific American, Vol. 34, No. 13 (1876), 1876, leaf 3
s. This coucrete, pro- later, was bright and run- perly dampened, was com- be in the proportion of 16 to 2, or of 8 to 1, to make the gas at once in molds at the spots needed. ——3s @ oo —_— and candle light equal at the distances given above. From : which it appears that, for reading and many other… … parts of water, as much as 84'5°, this comparison it will be seen that the candle © 1876 SCIENTIFIC AMERICAN, INC.

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