Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 78
ek. 5. How long will such a battery last? The platinum strips last till they are broken up by carelesshandling. The zincs dissolve or become perforated andworthless in about three months. A warm situation promotes dryness as well as chemicalactivity. 4. The Carbon 7JaM«*7/.—(see page 32.) 1. What… … and to have the clamps screwed up. The zincs require thesame treatment as for the Grove battery. New zincs mustbe thoroughly amalgamated a second time after three daysuse. 2. How of ten does the battery need cleaning?Fis-^ This battery needs to be tak-en apart oncein two weeks,when the zincsshould…
Telegraph
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