-=> Quoting Andy Ball to Tom Walker <=-

 TW> We can agree that the Vertical Rate is Synched to the 60 Cycle
 TW > Line and that the Frame Rate itself is 60.

 AB> (assuming NTSC) Wouldn't the /field/ rate be 60 Hz, and the
 AB> /frame/ rate 30 frames per second?
 
 Digging out my student text books from 1954-57 and college
 instructor reference books from 1964-74:

 There are 2 interlaced fields per frame.

 At 60Hz, each field (top to bottom) occurs every 1.6666E-02
 second, and 2 fields are produced every 3.3333E-02 second.

 Thus at 30Hz, or one-half the field rate, each frame occurs
 in 3.3333E-02 second.
      
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