We can only use shunt-wound dynamos conveniently for that purpose.
"Scientific American Supplement, No. 620, November 19,1887" by Various
The dynamo is provided with shunt fields which build up the current regardless of the arc light.
"The Traveling Engineers' Association" by Anonymous
The shunt-wound dynamo is used for incandescent lights.
"The Story of Great Inventions" by Elmer Ellsworth Burns
The characteristic of the shunt dynamo is that it gives practically constant voltage for all loads within its range.
"Hawkins Electrical Guide, Number One" by Nehemiah Hawkins
This dynamo has both shunt and series coils upon its fields.
"Physics" by Willis Eugene Tower