I have a series of five books called "Electrical Installations" written in 1902 by a Rankin Kennedy C.E. He makes the comment in Vol III:-
"The apprentice "electrical engineer" - using the term for those employed in actual manufacturing, installation, and generating works - must be trained as a mechanical and steam engineer, with an elementary knowledge of electricity and magnetism, and a general knowledge of the principles of dynamos, motors, wires, switches, instruments, &c., such as is found in these volumes. If the young man wishes to be an "electrician" then he need not trouble himself with mechanical or steam engineering, but confine his energy and time to electrical and magnetic studies, the electrical laboratory, test room, and drawing office. "The great mistake made in our technical schools is the attempt to teach too much, giving a very scanty training in many subjects, instead of a thorough training in a few correlated subjects."
It's a fascinating series of books, dealing (in a supplementary volume "V") with the "new" Electronic Theory.