. Electrical instruments and telephones of the Signal corps . n made of bent glasstube, and water put in its place. If theupper parts of the cells are warmed and smeared with paraffin, itwill help matters. But the best plan of preventing evaporationand creeping of salts is to use a good quality of paraffin or lubri-cating oil, pouring on a layer about one-fourth inch thick as soonas the cells are set up. In cleaning cells after that wet cottonwaste clipped in sand will clean the zincs, etc., of the adhering local batter3\ being much harder worked, requires renewingabout every six
. Electrical instruments and telephones of the Signal corps . n made of bent glasstube, and water put in its place. If theupper parts of the cells are warmed and smeared with paraffin, itwill help matters. But the best plan of preventing evaporationand creeping of salts is to use a good quality of paraffin or lubri-cating oil, pouring on a layer about one-fourth inch thick as soonas the cells are set up. In cleaning cells after that wet cottonwaste clipped in sand will clean the zincs, etc., of the adhering local batter3\ being much harder worked, requires renewingabout every six weeks; a main-line battery will usualh^ stand fromfour to six months. As soon as the blue solution goes down belowthe level of the copper, more bluestone should be added. Corrosionof the connections of the zincs with their wires should be carefullylooked after. It is better to have routine inspections of batteriesmade, and, if possible, instrumental tests, made with the voltmeters(figs. 165 to 174) or voltammeters (fig. 191) furnished for that pur-60240°—11 2. FiQ. 1. 18 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. pose, should be carefully recorded. By this means, deterioration maybe accurately noted and many annoyances, breakdowns, and delaysAvhich are frequently due to neglect and lack of regular inspectionof the batteries may be avoided. The internal resistance of a gravity cell in good condition will befound to be about 3 ohms, its E M F 1 volt. EUISOX IklMAKY BATIKKY. This battery is quite extensively issued by tlic Signal Corps and isknown as the tvj^e Y cell (fig. 2). The signal corps tjpe V cell is a slightly modified form of the Edi-son Lalande cell. As manufac-tured for the Signal Corps, it hasthe same capacity as the old EdisonLalande cells, but its enameled steeljar is slightly conical, enabling thecells to be nested together for trans-portation. The caustic soda andoil for each cell are issued in tincans, so that there is nothing thatAvill not stand transportatio
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