Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 41
cock c rapidly quite round, a puff escapes whichsends the needle in the direction of heat. This may bedone three or four times in succession. But the heating 16 HEAT A MODE OP MOTION. LBCT. I. at length ceases, and finally the needle moves in the direc-tion of cold. The reason is plain. This last… … they are pressed together, the air rushes out. The ex-pelled air, slightly warmed by compression, immediatelystriking the face of the pile, produces the deflection dueto heat. But if the nozzle be so far withdrawn as toleave the compressed air time to expand, a chilling insteadof a warming of the…
Heat
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