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.
1865 Excerpt: ...J "Meteorology," from the' Encyclopa-dia
Britanniea, ' by Sir J. Herschel, p. 50. but only the transport of
moisture, and in some measure also of heat, whilst in the second
case the vapour elevates the atmosphere, moves masses of air from
their place, and thereby every change in the vapour produces a
corresponding change in the equilibrium of the atmosphere. I will
now discuss more accurately some points in the vapourtheory itself.
In the first place it should be remarked that Dalton, when led by
his experiments to consider every gas as independent by itself, and
not subjected to the pressure of the rest, first conceived this
effect to exist in the mixture of permanent gases, and afterwards
transferred this effect to aqueous vapour also. But now, Dalton's
previous assumption having been proved to be unfounded in the case
of aqueous vapour, it may be asked whether it can be considered as
well founded in that of the permanent gases. There would be no
difficulty in deciding this by an experiment. I have not, however,
performed the experiment itself, because the Amongst the different
contrivances which could be formed to make the experiment, the
following appears to me to offer the least difficulty in its
execution: Take a glass vessel, of the form represented in the
figure, consisting of two spheres, A and B, and the open narrow
tubes, ab, cd, ef, which proceed from them. At first let the
communication between A and B be stopped by the cock g, and fill
the half ag with oxygen gas, the half gf with hydrogen, enclosing
them by the drops of quicksilver, p and q, upon which the
atmosphere presses from without. Now after, under such conditions,
equilibrium has established itself, open suddenly the cock g, and
the oxygen of the space A will effuse itself, a...
|Country of origin:
Royal Meteorological Society
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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