International Library of Technology · Scranton, International Textbook Co. · leaf 97
ace between the cup andthe carbon is filled witha substance (peroxide, orblack oxide, of manganese)with which the hydrogenformed when the cell is inaction combines. Direc-tions for setting up the cell accompany each one; the properamount of sal ammoniac for one charge is also sent witheach cell.… … Fig. 933. 1532 PRINCIPLES OF Before setting up the cell, unscrew the brass thumb-nut Bfrom the top of the carbon electrode, and scrape away what-ever paraffin or black wax there may be on the thumb-nut,its screw, or the surface upon w^hich the nut bears whenscrewed up tight. When properly set up,…
Electrical engineering
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