A lump of glass is found to weigh in air 577 grains; it is then
suspended by a horse hair from the bottom of the scale pan, and
immersed in a vessel of pure water, when it is found to weigh 399.4
grains. What is its specific gravity?
577.0 Then, as 177.6 : 1 :: 577.0 : sp. gravity.
399.4 1
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177·6 the difference 177·6)577·0(3·248, Ans.
532·8
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4420
3552
----
8680
7104
-----
15760
14208
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1552
[Illustration: FIG. 93.]
NOTE.—The above figures are introduced to show more vividly the
comparison between _bulk and weight_, the size of the different
substances, of course, being merely approximate. A study of the Table
of Specific Gravities to be found in the next page is worthy of the
time and attention.