The use of reactance in transformers

Until recently, reactance in transformers was considered only as an objectionable characteristic. To this there was one minor exception, which will be referred to later on, in connection with transformers to furnish constant current for arc lighting; but in general, because of its detrimental effect on regulation, reactance in transformers has been considered something to be avoided, and the more it was avoided the better was the transformer supposed to be fitted to its use.