The science of electricity and magnetism could only advance by getting regular supplies of electricity from the common electric machine or the galvanic battery and by making powerful electromagnets.
"How We Think"
John Dewey
It will be understood that electromagnets were the ticker's actuating agency.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin
In a shunt circuit with the receiving instrument he introduced electromagnets.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin