>Meryem--wheels appear to spin backwards when photographed if they
>are spinning at less than 24 times a second (or a multiple of that).
>They would have to spin at exactly 24 times a second to appear to
>be stationary and faster to appear to go forward. As for "persistence
>of vision," it is rather embarrassing to admit as a co-editor of a
>journal of that name, that that theory ofperception has been disproved as
>an adequate explanation of why we see film as moving, as has the psi
When we watch TV Persistence of vision comes in to play, but also the
phosphor on the picture tube has a persistence as that little beam sweeps
back and forth turning on and off at various spots of the screen. That's
why I would rather have light letters on a dark background, cheaper
electricity over the years and holds those little accelerated electrons
that fly out of the tubes into my upper organs to a minimun. Your CRT
should last longer too.
73, Uncle Art NE Pa.
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