-=> Quoting Ken Weitzel to Tom Walker <=-

 TW> We can agree that the Vertical Rate is Synched to the
 TW> 60 Cycle Line and that the Frame Rate itself is 60.
     
 KW> Perhaps you guys want to agree that vertical is
 KW> sync'ed to the ac line, but I don't :)

 Originally, in the old B&W standard, the vertical was synced
 to the power line frequency AT THE TRANSMITTER.  This was done
 to reduce/eliminate flicker produced from a beat between the
 vertical oscillator and the AC line.

 (Flicker is different from loss of vertical sync, when the
 picture completely rolls and rolls and rolls.)

 But it was soon discovered that all power lines in the U.S. are
 NOT synced to each other.  A viewer 50-100 miles away from the
 station may obtain electricity from a totally different utility
 company that generates its own power.

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