Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 88
e sun-beam with a lens, on thesouth pole of the suspended needle, and foundthat the needle was thrown into a rapid, tremulous motion. Buthere the hot air ascending from the needle, acts upon it as upon thesail of a windmill; and the same effect ought to take place, to a cer-tain extent, on simple… … Ex. Length ot needle ininches. No. of vibr. inshade. In the sunbeam. 1^ sewing needle2 blue spring31 do. 44 3226 443226 Tlierm. in the sun, 109 to 105.—Barom., 29.3.—Duration of Exp., 6U ft is said expressly, in the ac-count of Christies experiment, thatthe needle was contained in a brasscompass…
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