This voltaic battery, devised by Cruickshank in 1800 and made by R & G Knight of London, is an improvement on Volta's original 'pile'. The copper-zinc pairs are mounted on separate compartments in a wooden box, forming a horizontal series of 50 pairs. The cells are filled with a solution of common salt, or with dilute acid. This type of battery retained its charge much longer than the original Volta pile type.
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