Gravity cells

Daniell cell (also known as a Crow s Foot or Gravity cell.)... 

This cell produces a voltage of about l.l volts, the difference of the values of shown in the table. The cell is used to some extent in practice it is called the gravity cell when it is made as shown in Figure 12-5. 

The Ckimmon Dry Cell. One primary cell, the gravity cell, has... 

Daniel cell (gravity cell) A special copper/zinc battery, where a spontaneous chemical reaction between zinc metal and aqueous copper (II) sulfate is conducted in which the chemical energy released is in the form of electrical energy. Invented in 1836 by Englishman John F. Daniel. 

The Daniell gravity cell was one of the earliest galvanic cells to find widespread practical application. It was used in the mid-1800s to power telegraphic communication systems. As shown in Figure 18F-1, the cathode was a piece of copper immersed in a saturated solution of copper sulfate. A much less dense solution of dilute zinc sulfate was layered on top of the copper sulfate, and a massive zinc electrode was located in this solution. The electrode reactions were... 

Gravity Cells and. Centrifugal Cells cf R C Tolman, Proc Amer Acad, 19x0)... 

Just as with gravity cells, the measurements involving centrifugal force may be used with the aid of equation (10) to compute transference numbers. Table III contains the results of Tolman s measure-... 

The study of gravity cells was taken up again 20 years later by Des Coudres (9l9). His theoretical treatment included a buoyancy correction, the necessity for which had been pointed out to him by Nernst in a letter. In fact, the need for it had already been recognised by Colley (H). Des Coudres measured the potentials of cell II and also of cells of type III... 

One primary cell, the gravity cell, has been described in Section 11-5. This cell is called a wet cell, because it contains a liquid electrolyte. A very useful primary cell is the common dry cell, shown in Figure 11-8. The common dry cell consists of a zinc cylinder that contains as electrolyte a paste of ammonium chloride (NH4CI), a little zinc chloride (ZnClg), water, and diatomaceous earth or other filler. The dry cell is not dry water must be present in the paste that serves as electrolyte. The... 

Specific gravity = cell open-circuit voltage — 0.845... 

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