Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 76
ut it should be pure. With care the cell will last for weeks. When it weakens or runs down, an addition of sulphuric acid to the outer jar and 56 HAWKINS ELECTRICITY a few more crystals placed in the porous pot will put the cell ingood condition. Gravity Cells.—In a two liquid cell, instead of… … FlG. 53.—Daniell gravity cell, crowfoot pattern. This is a two fluid cell in which gravityinstead of a porous cup is depended upon to keep the liquids separate. The two solu-tions consist of copper sulphate and dilute sulphuric acid, the elements being made ofzinc and copper. the lighter floating…
Electrical engineering
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