Reviews Engineering Invention: Frank J. Sprague and the U.S. Electrical Industry by Frederick Dalzell Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News December 31, 2009 at 12:08 pm The inventor and entrepreneur worked for Edison before coming up with the electric railway and electric elevator.MIT Press, 2009, 288 p., $30. ENGINEERING INVENTION: FRANK J. SPRAGUE AND THE U.S. ELECTRICAL INDUSTRY BY FREDERICK DALZELL