Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 291
see Fig. 343,they begin to shinewith a peculiar softradiance. The lightmoves away fromFig-343- them in straight lines, as from any other source. There is, however, a limit to the action of these movingmolecules, for if the current is allowed to act continuously,after a time, the fluorescence… … 282 TABLE L—SCALE OF HARDNESS. 1 Talc. 2 Rock Salt. 3 Calcspar. 4 Fluorspar. 5 Apatite. 6 Feldspar. 7 Quartz. 8 Topaz. 9 Corundum.10 Diamond. TABLE II. — COMPARATIVE TENACITY OFDIFFERENT WOODS. This table gives the breaking load, in pounds, that a square inch ofsection will hold. The English system…
Physics
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