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IN no branch of engineering has the mutual dependence and reaction between practice and theory been more beneficial than in the useful appliances of electricity. Without theory the rule-of-thumb telegraphist would have been stationary. Without practice the electrician would have been a dreamer. The practical difficulties of telegraphy incited the physicist to trace out the laws that govern the behaviour of this subtle Power of Nature, and the appearance of new facts has driven the practicaldoi:10.1680/imotp.1884.21616 fatcat:ijbmq7jhznhonagnzk5km2elsq