Service chemistry : being a short manual of chemistry and metallurgy and their application in the naval and military services / by Vivian Byam Lewes and J.S.S. Brame.

  • Vivian Byam Lewes
Date:
1913
Catalogue details

Licence: In copyright

Credit: Service chemistry : being a short manual of chemistry and metallurgy and their application in the naval and military services / by Vivian Byam Lewes and J.S.S. Brame. Source: Wellcome Collection.

    73/622 page 51
    Grove’s Cell 51 and carbon in each cell, and using a partition of fearnought between the mixture of carbon and pyrolusite and the ammonium chloride solution containing the zinc. In the Leclanche cell (Fig. 11) a is the carbon plate on to which is cast the lead connection and binding screw (b) ; d is the mixture of pyrolusite and carbon surrounding the carbon plate ; and e the zinc plate immersed in the saturated ammonium chloride solution (f), the fearnought partition being replaced by a porous cell in older forms, but in the most recent patterns no cell Fig. 11.—Leclanche cell. Fig. 12.—Grove cell. is employed, the pyrolusite-carbon mixture blocks being fitted on the carbon rod. In one form of Leclanche the carbon and manganese dioxide are cast into blocks or sticks, and these are fixed to the carbon plate by elastic bands, the whole being kept from contact with the zinc by having a piece of coarse sacking wound round it. Grove’s Cell.—Grove’s cell depends upon the solution of zinc in sulphuric acid to generate the current, whilst the negative metal present is platinum, and the liberated hydrogen is oxidised to water by strong nitric acid. A U-shaped zinc plate (Fig. 12) is immersed in dilute sulphuric acid contained m an ebonite or earthenware vessel, and inside
    digitised image 1
    digitised image 2
    digitised image 3