Clark and Weston standard cells . formed. To prevent mechanical loss the inner dish was coveredwith a perforated crystallizing dish, through which the glass stirrerand anode connection passed. A metallic shield attached to theshaft of the stirrer prevented possible contamination by oil andparticles of metal from the bearing. Nine samples, of which seven were preserved, were made in 1904,and four others in 1905, using this form of apparatus, which was designed to give a whiteproduct free from finelydivided mercury, as perTable I. The currentdensity was kept ampere per squaredecimeter
Clark and Weston standard cells . formed. To prevent mechanical loss the inner dish was coveredwith a perforated crystallizing dish, through which the glass stirrerand anode connection passed. A metallic shield attached to theshaft of the stirrer prevented possible contamination by oil andparticles of metal from the bearing. Nine samples, of which seven were preserved, were made in 1904,and four others in 1905, using this form of apparatus, which was designed to give a whiteproduct free from finelydivided mercury, as perTable I. The currentdensity was kept ampere per squaredecimeter in the prepa-ration of all the sam-ples. (b) Electrolytic meth-od, new apparatus.—Inthe preparation of theremaining samples ofelectrolytic mercuroussulphate, the apparatuswas so modified as toperm it the use of greatercurrent densities, whichnecessitated more effi-cient stirring. A layerof mercury 3 to 4 cmdeep, purified as de-above, was h2so4 Hg<.
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