Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . yiG. 147.—Hills Gravity Cell.—This cell is employed very extensively in telegraphy, and isrecommended by some authors for permanent medical batteries. When the jars are wellparaffined at the top, the cells do not salt badly. They require but little care when prop-erly set up. Personally, 1 prefer a modification of this cell (in which the zinc is placedwithin a suspended porous cup) to the one shown in the cut. It requires less
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . yiG. 147.—Hills Gravity Cell.—This cell is employed very extensively in telegraphy, and isrecommended by some authors for permanent medical batteries. When the jars are wellparaffined at the top, the cells do not salt badly. They require but little care when prop-erly set up. Personally, 1 prefer a modification of this cell (in which the zinc is placedwithin a suspended porous cup) to the one shown in the cut. It requires less care, and is notaftected by agitation. It also has a higher internal resistance. out an intervening diaphragm, on top of the copper solution, andimmerses the zinc disk. This battery must not be agitated, as the twosolutions would then become mixed. E. M. F. = Grovels Cell (1839).—This consists of amalgamated zinc immersedin dilute sulphuric acid Avithin a porous pot. Outside of this pot plati-. FiG. 14S — Ceil.— This cell (shown here in the form of a battery) is not used in medi-cal practice, chiefly on account ot the fumes which arise from it If used in the mechanicalarts. It is a very expensive cell to employ. Dynamo machines have now taken the place ofGrove batteries to a very great extent. nam is immersed in nitric acid placed in a glass jai-. E. M. F. = The platinum is bent into an S-shape to increase its modifications of this cell have been made for use in mechanicalarts. The fumes arising from it are veiy objectionable. ATTACHMENTS TO A COMPLETE BATTEKY. 627
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