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. 1867 Excerpt: ... case the quantity of electricity is three, and in the latter four and a half times greater than when the plates of copper and zinc are of equal size. The late Prof. Daniell, however, proved that if the diameter of the mean section of the active fluid remains the same, and all interfering causes arising from deposition ...
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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. 1867 Excerpt: ... case the quantity of electricity is three, and in the latter four and a half times greater than when the plates of copper and zinc are of equal size. The late Prof. Daniell, however, proved that if the diameter of the mean section of the active fluid remains the same, and all interfering causes arising from deposition on the conducting plate he removed, it matters but little, so far as the resulting current is concerned, whether the generating or the conducting element be of larger dimensions. 771. Smee'g Battery.--A convenient and certainly powerful arrangement has been proposed by Mr. A. Smee, consisting of two plates of amalgamated (765) zinc, zz, Fig. 449, clamped to a piece of wood, B, by means of a bent piece of brass, c, Kg. 419. furnished with a binding screw at a. Between ui iyA the plates of zinc is fixed a thin plate of silver.1 "j connected at its upper end with another binding Ltoeij screw. This plate of silver is covered with a thin j layer of platinum, by immersing it for a short time in a solution of chloride of platinum whilst z connected with the negative electrode (766) of a voltaic battery. The platinum is deposited on p!H the plate in the form of a fine powder, and from the myriads of conducting points thus formed by the inconceivably minute particles of reduced metal, the evolution of the hydrogen gas is greatly facilitated. An arrangement of this kind, placed m a pint jar of dilute sulphuric acid, becomes an excellent and efficient source of electricity. 772. In the arrangements of apparatus above described, a considerable loss of electricity occurs during the evolution of the hydrogen. To prevent this, certain means have been had recourse to, for the purpose of absorbing the hydrogen, by employing it to reduce metallic oxides, ...
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