Abridgment of the automatic substation and its relation to the electric distribution system

Some 15 years ago in a substation supplying power to an interurban electric railway system it was demonstrated that electro-mechanical devices could be made to operate the apparatus so successfully that human attendance might not be necessary. Since that time, the development of these automatic devices has been extremely rapid and as a result of the progress in this branch of the art, the automatic substation of today has reached a high state of development.