The Philosophical magazine; a journal of theoretical, experimental and applied physics . No. XXIII. Report of a Cornmit tec of the Academy of Natural Sci-ences of Philadelphia, on a new Hydrostatic Balance in-vented by Isaiah Lukens. Read May 26, ISIS*. .1 HE undersigned Committee beg leave to report, that the in-strument invented by Mr. Lukens, and referred to them by theAcademy, consists of a very sensible steelyard or Roman balance,so arranged as to be particularly adapted to the finding of specificgravities. The arms of the balance are so constructed, in tliefirst instance, as to be in
The Philosophical magazine; a journal of theoretical, experimental and applied physics . No. XXIII. Report of a Cornmit tec of the Academy of Natural Sci-ences of Philadelphia, on a new Hydrostatic Balance in-vented by Isaiah Lukens. Read May 26, ISIS*. .1 HE undersigned Committee beg leave to report, that the in-strument invented by Mr. Lukens, and referred to them by theAcademy, consists of a very sensible steelyard or Roman balance,so arranged as to be particularly adapted to the finding of specificgravities. The arms of the balance are so constructed, in tliefirst instance, as to be in exact equipoise, when unloaded. Theobject [C, fig. 1, Plate II.] of which the specific gravity is to beascertained is suspended to the shorter arm, by any of the usualmethods; and its relative weights in air and iu water are indi-cated by the numbers on the graduated arm [A] at which themoveable weight or pea [D] is suspended, v/hen the beam isbrought into a horizontal position. It is evident that the abso-lute weight of the pea is arbitrary, and it is one of the advantagesof the instrument
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