This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1886 Excerpt: ... December 31... mm () 12 ni... 3a.m. 12 m... 1
About 2 mm. each. 147 158 II. 09 riso 165 I 18(1 '.;..' 170 1.1 '1
If we regard dasa function of h we find it linear in the case of
white and of red bolus and quadratically retarded in the case of
tripoli, but to the latter fact I would attach no significance. It
may be due to the unavoidable fluctuations of temperature.1 So long
as the descent is uniform (d proportional toh) the force acting ou
the particle is nil. The effect of gravity is exhausted in doing
work against the frictional resistance. In Table 3 are given the
results obtained with fine tripoli suspended in distilled water to
which various percentages (by weight) of common salt (XaCl) have
been added. The precipitation tubes in this series of experiments
were 3 cm. in diameter and 15 cm. long. Values for d are given only
when planes of demarkation were observable. In other respects the
table is like the preceding one, except that d is here expressed in
millimeters. Where two sets of figures are given, two surfaces were
apparent. Table 3.--Subsidence in salt solutions. The experiments
show that the rate of sedimentation increases rapidly with the
quantity of salt in solution; that even small quantities of salt
produce very marked effects; d varies linearly with h. The absence
of stratification in cases of greater rates of subsidence
(solutions 1 to 15 per cent.) is confirmatory of the remarks made
in au earlier paragraph (p. 16) on the rearrangement of particles
according to the density of different parts of the liquid and
accords well with the other views there given. The remarkably
accelerated increase of rate observed on passing from fractional to
integral per cents, (composition) is to be noticed. 1 See p. 20 as
to convective currents ami the ch...
|Country of origin:
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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