Marking dynamos for repair $10,000.00 -- 2 hours labor $10.00; knowing where to mark $9,990.00.
Source: From his itemized bill sent to Henry Ford; In 2500 Anecdotes for All Occasions, by Edmund Fuller, 1970.
-- Charles Steinmetz, (Apr 9 1865-1923), German-US electrical engineer; His ideas on alternating current systems helped inaugurate the electrical era in the United States.