"Sixty cycles has ever since been the standard for alternating current" That's incomplete. Los Angeles, for example, had 50 Hz power until the late 1940s. (Fo

"Sixty cycles has ever since been the standard for alternating current" That's incomplete. Los Angeles, for example, had 50 Hz power until the late 1940s. (For references: http://www.oldradio.com/archives/stations/LA/mtwilson3.htm http://www.oldradio.com/archives/stations/LA/mtwilson3.htm says "It is interesting to note that until early 1949 the Southern California Edison Company supplied 50 Hertz power to Mt. Wilson." and http://www.earlytelevision.org/national_schools_camera.html http://www.earlytelevision.org/national_schools_camera.html "It should be noted that Los Angeles used 50 Hz power at that time.")