The Romance of Modern Chemistry
Forfatter: James C. Phillip
År: 1912
Forlag: Seeley, Service & Co. Limited
Sted: London
Sider: 347
UDK: 540 Phi
A Description in non-technical Language of the diverse and wonderful ways in which chemical forces are at work and of their manifold application in modern life.
With 29 illustrations & 15 diagrams.
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CHEMISTRY AND ELECTRICITY
duction of an electric current are very well illustrated
by reference to the Daniell cell, which is only slightly
different from Volta’s original one. The metals in the
Daniell cell are the same as those in Volta’s cell, zinc
and copper, but instead of
water, the zinc plate dips
zinc, and the copper plate
Fig. 13.—Daniell Cell.
copper pot which holds the copper sulphate solution.
If, now, the zinc pole is connected with the copper pole
by means of a wire, an electric current runs through this
wire from the copper to the zinc. The passing of a
current is evidence that work is being done by the cell,
and the question therefore arises—What is the source
of the energy ?
In the grandfather’s clock the equivalent for the driving
of the works is found in the gradual fall of the weights
—a fairly obvious phenomenon ; but a cursory inspection
of the Daniell cell does not reveal any marked change
292
jeing immersed in acidulated
in a solution of sulphate of
in a solution of sulphate of
copper. The two solu-
tions are prevented from
mixing by a partition of
porous earthenware, gene-
rally in the form of a
cylindrical pot, inside
which is the zinc sulphate
and the zinc pole of the
cell, and round which is
the sulphate of copper
solution with the copper
pole. In the form of
Daniell cell represented in
the diagram the copper
pole is replaced by a