An elementary book on electricity and magnetism and their applications . he negative terminalby a short piece of wire, and it willwork itself into good operatingcondition; or a little sulphuricacid or zinc sulphate solution maybe carefully poured into the water,and the cell will at once be in con-dition. If a gravity cell is allowed tostand with the circuit open, thetwo solutions will slowly mix by diffusion. When any of thecopper sulphate solution reaches the zinc, a black deposit ofoxide of copper is made upon it. This puts the cell in suchcondition that it will not work satisfactorily until
An elementary book on electricity and magnetism and their applications . he negative terminalby a short piece of wire, and it willwork itself into good operatingcondition; or a little sulphuricacid or zinc sulphate solution maybe carefully poured into the water,and the cell will at once be in con-dition. If a gravity cell is allowed tostand with the circuit open, thetwo solutions will slowly mix by diffusion. When any of thecopper sulphate solution reaches the zinc, a black deposit ofoxide of copper is made upon it. This puts the cell in suchcondition that it will not work satisfactorily until the zinc hasbeen cleaned. When the cell is in operation, the copper sul-phate is changed into zinc sulphate so rapidly that it gets nochance to mix with the latter. A gravity battery, therefore,is satisfactory only in service which keeps it constantly work-ing. For this reason and also because it does not polarizein the least, it is called a closed-circuit battery. When notin use, the gravity cell should be short-circuited through aresistance of from 300 to 400 Fig. 11, Gravity or crowfootcell. 22 ELECTRICITY AND MAGNETISM
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