Sprague Frank Julian

Sprague

 (sprāg), Frank Julian 1857-1934.
American engineer and inventor. He developed the first electric trolley system (1887) and made advances in electric elevator design.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.