Sperry Elmer Ambrose
Sper·ry(spĕr′ē), Elmer Ambrose 1860-1930.
American engineer and inventor of numerous electrical devices, including the gyrocompass, a nonmagnetic navigational aid (1910).
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.