Elementary treatise on electric batteries . ion of sulphate of copper tends to increase theinternal conductivity of the element, although it takesno part in the regular chemical action which produces thecurrent. Since then, Mr. G. dInfreville has sent us thevery interesting results of his experiments upon this sub-ject. He has found that this disposition causes a diminu-tion in the electro-motive force. This will not seem sur-prising to physicists, for they will readily understand thatin Kragers or any analogous battery the circuit becomes 130 TWO-LIQUID BATTERIES. closed by the sulphate of zi
Elementary treatise on electric batteries . ion of sulphate of copper tends to increase theinternal conductivity of the element, although it takesno part in the regular chemical action which produces thecurrent. Since then, Mr. G. dInfreville has sent us thevery interesting results of his experiments upon this sub-ject. He has found that this disposition causes a diminu-tion in the electro-motive force. This will not seem sur-prising to physicists, for they will readily understand thatin Kragers or any analogous battery the circuit becomes 130 TWO-LIQUID BATTERIES. closed by the sulphate of zinc at the top; a constant de-rived current is thus produced, and consequently the dif-ference of potential is diminished between the electrodes, SIK WILLIAM THOMSONS BATTEEY. This illustrious physicist invented a very original dis-position of the Daniell gravity battery. The elements arepiled up one upon another as in Voltas column batteryor as in Marie Davys sulphate-of-lead battery. These elements (Fig. 33) consist of wooden trays, lined. Fig. 33. on the inside with lead to make them, water-tight. Atthe bottom of each tray is placed a thin plate of the four corners of this square tray are little blocks ofwood which support the zinc electrode. This latter hasthe singular form of a gridiron, having its bars very close,but still leaving space enough between for the circulationof the liquid. The feet of this gridiron are turned up-wards, supporting the cell above. In some instances the zinc is wrapped in parchment GEAVITY BATTERIES. 131 paper, thus constructing a porous jar which prevents themingling of the liquids; this may, however, well be dis-pensed with. The connection between one cell and the following oneis simply obtained by their weight, which presses the leadon the bottom of each tray upon the four corners of thezinc below. Care must be taken in charging the cells, to place themin a perfectly horizontal position; this can be easily as-certained by pouring some
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