The boy's playbook of science : including the various manipulations and arrangements of chemical and philosophical apparatus required for the successful performance of scientific experiments / by John Henry Pepper ; illustrated ... by H.G. Hine.

  • John Henry Pepper
Date:
1862
Catalogue details

Licence: Public Domain Mark

Credit: The boy's playbook of science : including the various manipulations and arrangements of chemical and philosophical apparatus required for the successful performance of scientific experiments / by John Henry Pepper ; illustrated ... by H.G. Hine. Source: Wellcome Collection.

    66/470 page 52
    but the contrary is the case, and by thrusting the crown into the water, it may be seen to rise with great buoyancy so long as the 17£ ounces are retained in the other scale-pan; and it will be found necessary to place at least two ounces in the scale-pan to which the crown is attached before the latter sinks in the water; and thus it is distinctly shown that the crown weighs only about 15| ounces in the water, and has therefore lost instead of gaining weight whilst immersed in the liquid. The rule may now be worked out: Ounces. Weight of crown in air 17i Ditto in water ]5| Less in water 2 875 The quotient 8f demonstrates that the crown is manufactured of copper, because it would have been about 19J if made of pure gold. Fisr 68 a. Ordinary pair or scales, b. Scale-pan, containing 17^ ounces, bcin^ tho •weight of tho crown in air. 0. Pan, with hook and crown attached, which is sunk in the water contained in tho vessel d ; this pan contains the two ounces, which must be placed there to mako the crown sink and exactly balance u.
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