is rate is j|s per an apparatus invented by him, to render weak sounds copper at the temperature of liquid air. A coil of cop- degree Centigrade. Now if a cooling of one degree audible, and in 1845 a kind of steam whistle or trumpet per wire was fastened to the top ■ of a box into which causes a… … Temperatures Centigrade. The Conductivity of Lightning Rods.—Some inter- deflection of its magnetic needle is graduated by com- esting experiments bearing on the conductivity of parison .with a standard thermometer, so that the effect Fig. l.-ELECTRICAL RESISTANCE OF METALS AT lightning conductors…
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