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American Railway Signaling Principles and Practices Batteries Chap 5 1927
American Railway Signaling Principles and Practices Batteries
Approx 85 pages
Copyright 1927
Batteries are to the signal system what engines are to trains. They supply the power or energy to operate the direct current apparatus.
While there are many different types and makes of batteries, they are divided into two general classes, primary and secondary, which will be treated separately. Each class is divided into various types. The principal types of primary batteries used are gravity, dry and caustic soda. The types of secondary batteries used are lead acid and nickel, iron, alkaline. The service which the battery is called on to perform usually determines which class and type is to be used. Ordinarily the primary battery is used where normally low discharges are required and no practical means of charging are available. The secondary (or storage) battery is generally used where higher discharges are required, in which case a means of charging must also be available.
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