A manual of practical medical electricity : the Röntgen rays and Finsen light . Fig. 20.—Persulphate of Mercury Cell Battery. the former attacks the zinc, while the latter collects at thebottom. In the old form, the cell resembled the Daniell, and hada porous pot, the sulphate of mercury taking the place ofthe sulphate of copper, and the carbon that of the porous pot is dispensed with in the later forms. Gaiffe uses a divided ebonite trough to form two smallcells. The carbon plates are placed at the bottom of the 44 A Manual of Practical Medical Electricity trough, and are smeared o
A manual of practical medical electricity : the Röntgen rays and Finsen light . Fig. 20.—Persulphate of Mercury Cell Battery. the former attacks the zinc, while the latter collects at thebottom. In the old form, the cell resembled the Daniell, and hada porous pot, the sulphate of mercury taking the place ofthe sulphate of copper, and the carbon that of the porous pot is dispensed with in the later forms. Gaiffe uses a divided ebonite trough to form two smallcells. The carbon plates are placed at the bottom of the 44 A Manual of Practical Medical Electricity trough, and are smeared over with a paste of sulphate ofmercury ; the zincs form Hds which he over them. In Schanschieffs ceh there are two carbons to each zinc,and a strong solution of the basic sulphate is the excitant. In some of the later forms of sulphate of mercurybatteries, there is an arrangement for raising or loweringthe elements out of or into the solution, according to thestrength of current required, and, to insure portability,. Fig. 21.—Arrangement of Zinc and Carbon. the vessels are provided with floating ebonite pieces toprevent spilling of the acid solution (Figs. 20 and 21). Gaiffe also sells the excitant in the form of a salt, whichhas only to be dissolved in water. The small cells of Gaiffe are suitable for working in-duction coils, the larger cells for galvanization and otherpurposes. This battery has found much favour in France ; it isasserted that it is very constant, that it gives off no fumes,that the zincs are kept constantly amalgamated by themercury which is precipitated in the cell during action, Forms of Primary Cells 45 and that, while the E. M. F. is the same as that of theLeclanche, depolarization is more perfect. The Hellesen or Dry Leclanche Cell. This is a form of dry cell manufactured by Siemens andCo., and supplied for medical purposes by Schall (Fig. 22). (a) The composition of the electrolyte is a secret, butit appears to consist of a paste containing ammoni
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
