Interesting Historical Engineering Article<https://spectrum.ieee.org/history-of-power-grid> on Henry Warren and the history of 60HZ as a time standard. Thomas D. Erb p: 508-359-4396 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: tde at electrictime.com w: www.electrictime.com Tower & Street Clocks Since 1928