A text-book on chemistryFor the use of schools and colleges . Fig. 119. moist flannel is replaced by liquid contained in glassvessels, the copper, C, and zinc, Z, being connected bywires soldered to them. Cruickshanks battery consists of a box or trough,Fig. 119, three orfour inches squareat the ends, and afoot or more are madein the sides and bot-tom of this box, andinto them pieces of zinc and copper, soldered faceto face, are fastened water-tight by cement. Thesegrooves are about half an inch apart, and into their in-terstices acidulated water is poured, care being taken What a
A text-book on chemistryFor the use of schools and colleges . Fig. 119. moist flannel is replaced by liquid contained in glassvessels, the copper, C, and zinc, Z, being connected bywires soldered to them. Cruickshanks battery consists of a box or trough,Fig. 119, three orfour inches squareat the ends, and afoot or more are madein the sides and bot-tom of this box, andinto them pieces of zinc and copper, soldered faceto face, are fastened water-tight by cement. Thesegrooves are about half an inch apart, and into their in-terstices acidulated water is poured, care being taken What are its inconveniences? Describe the crown of cups. De-scribe Cruickshanks 152 daniells battery. that the metals are arranged in the same direction, sothat if the series begins with a copper plate it ends witha zinc. The apparatus is obviously equivalent to Vol-tas pile laid on its side, and the facility for charging it,and removing the acid when the experiments are over,is very great. From the two extremities flexible cop-per wires pass ; they are called the polar wires, or elec-trodes of the battery. The object of amalgamating the zinc in Voltaic bat-teries is to prevent what is termed local action, a wastein which much metal is consumed, without adding tothe power of the current, and which likewise deterio-rates the acid liquid by the accumulation of sulphate ofzinc. When amalgamated, all the zinc consumed aidsin the current. When it is required to have a current, the intensityFig. 120. of which remains constant for a length oftime, Daniells battery is to be preferred. Itconsists of a copper cylinder, GrFlg. 120, inwhich a solution of acid sulphate of cop
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