Elementary treatise on electric batteries . Fig. 41. This form has been preserved in Germany and abandonedin France. Figs. 40, 41, and 42 represent the Bunsen cell prop-erly so called, with a hollow cylinder of rolled zinc. The ACID BATTERIES. 173 glass jar is narrowed at the top in order to check theevaporation of the nitric acid. Sometimes the hollow zinc cylinder is replaced by arod of cast zinc. Siemens prefers a rod of cast zincwhose section has the shape of a cross. The rod of zinc inconveniently reduces the space occu-pied by the dilute sulphuric acid, and consequently thequantity of th
Elementary treatise on electric batteries . Fig. 41. This form has been preserved in Germany and abandonedin France. Figs. 40, 41, and 42 represent the Bunsen cell prop-erly so called, with a hollow cylinder of rolled zinc. The ACID BATTERIES. 173 glass jar is narrowed at the top in order to check theevaporation of the nitric acid. Sometimes the hollow zinc cylinder is replaced by arod of cast zinc. Siemens prefers a rod of cast zincwhose section has the shape of a cross. The rod of zinc inconveniently reduces the space occu-pied by the dilute sulphuric acid, and consequently thequantity of the acid. The other two dispositions seem. Fig. 42. preferable. Here arises the question, Which is the betterarrangement, the German or the French ? The German model contains more nitric acid, whichmay increase and prolong the constancy of the we think the French model ought to be preferred,because in the German arrangement the carbon is muchmore expensive, the zinc is not as convenient to amalga-mate on account of the strip and ring of copper solderedto it, and the expense of the acid is greater. 174 TWO-LIQUID BATTEEIE8. FAUBES MODEL. English books mention a form of carbon battery whichdeserves notice. The carbon proposed by Fanre has theshape of a bottle closed with a carbon stopper. This car-bon serves at the same time as porous jar and as negativeelectrode. It contains the nitric acid, and the vaporswhich free themselves force the liquid into the pores ofthe carbon, producing depolarization. This form has been but seldom used. It would, how-ever, be worthy of study, as it presents economical ad-vantages and su
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