Dave
Guest
Sat May 14, 2005 12:30 pm
Hi,
How is AC 60 Hz and not 30 Hz. What is so significant about 60
or 50Hz? Can't bulb or electric motors run at 20 Hz or so??
Dave
spudnuty
Guest
Sun May 15, 2005 10:42 pm
Hmm this site:
http://en.wikipedia.org/wiki/Alternating_current
says:
"It is generally accepted that Nikola Tesla chose 60 hertz as the
lowest frequency that would not cause street lighting to flicker
visibly. The origin of the 50 hertz frequency used in other parts of
the world is open to debate but seems likely to be a rounding off of
60hz to the 1 2 5 10 structure popular with metric standards."
Actually early silent movies were projected at 16 frames per second as
that was felt to be the slowest frame rate to be smooth to the human
eye. I feel we can sense when something is running even at 24 frps.
Which is what Douglas Trumbull was doing when he developed Showscan
which is 65mm running at 60frps. I have seen this in "Brainstorm" and
the simulation of reality is very unsettling. Showscan has been used
in some theme park rides or simulators. Has anyone experienced any of
these?
Richard
