Identifier: elementarytreati00niau (find matches)
Title: Elementary treatise on electric batteries
Year: 1880 (1880s)
Authors: Niaudet, Alfred, 1835-1883. (from old catalog) Fishback, L. M., (from old catalog) tr
Subjects: Electric batteries
Publisher: New York, J. Wiley & sons
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ney, in whichthere is a glass tube through which a copper wire, at-tached to the negative electrode, passes, forming the con-nection of the positive pole. The porous jar sustains amass of paper pulp, dampened with sulphuric acid, andthen dried. The zinc, 2, placed on top of the pulp, is avery thick cylinder, melted in a mould and carrying avertical appendix, to which the positive connection ofthe adjoining cell is attached. The arrangement of this battery has been changedseveral times. At first there was no porcelain porousjar, but simply the paper pulp. The general character-istics, however, have remained the same. The greatthickness of the porous jar suppresses almost completelythe diffusion of the sulphate of copper, and consequentlythe waste chemical action and the useless consumption ofzinc and sulphate of copper are avoided. On the other 110 TWO-LIQUID BATTERIES. hand, however, the internal resistance of the cells is con-siderable, so that they cannot be used as local batteries.
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Fig. 26.TABLETS BATTEET. Cromwell Varley suggested a means of completely sup-pressing the passing of the sulphate of copper through Ill the porous partition, a tiling which Siemens and Halskeonly slightly diminished and slackened. This means con-sists in the substitution of oxide of zinc for the paperpulp in the preceding battery. It is easily understoodthat the sulphate of copper, which enters the mass ofoxide of zinc, forms sulphate of zinc, and deposits oxideof copper in the shape of a black powder. This original idea was perhaps never put into applica-tion outside of Varleys laboratory. But it deservesnotice, for it shows the reader what an infinite varietyof resources chemistry presents to those who know howto search for them. It is clear that this porous partition becomes destroyedin time ; it is also very resistant. These are all incon-veniences in daily practice, but are unimportant in labo-ratory experiments, which require as perfect a battery aspossible. MINOTTOS BATTEEY. Th

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