Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 88
was the cause ofthe derangement in question;! there-fore vibrated a needle, under similarcircumstances, with the same resultas above stated. I should mentionthat this wasdonein asolid cylinder,or ring, of brass, without any seam,or soldered junction; but as com-pass boxes are generally made ofsheet… … 82 Experiments on Light. the warmth of the sun-beam. I therefore made a compound cylinderof copper and zinc, c z, the edges of whicli, at a and b, were neatlysoldered, the junction h being highly polished, and that at a black-ened. The needle was suspended in an exhausted receiver, by asilk fibre,…
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