Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 269
ies together; but the same substance may 244 HEAT A MODE OF MOTION. LECT. IX, possess different powers of conduction in different direc-tions. Many crystals are so built, that the motion of heatruns with greater facility along certain lines than alongothers. That heat travels with greater facility… … axis of the crystal, and the other (fig. 77) parallel toit. The plates are coated with a layer of white wax, laidon by a camels-hair pencil. They are pierced at thecentre, and into the hole is inserted a small sewing-needle,which can be warmed by an electric current, b (fig. 75) isthe battery,…
Heat
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