On Wed, 4 Apr 2001, John Allain wrote:
> First fax
machine was over 100 years ago with synchronized
> pendulums.
How do you synchronize to a remote pendulum?
I'm stepping into memories now, including college physics,
But, as I recall and understand, the pendulums would basically
oscillate at the same frequency since they were of the same length.
All that would be required is to send a synch pulse at the end
of a scan (rough analog to TV VIR) to align the next full scan.
The remainder body of the pendulum swing would be kept
in tune using only the ballistic physics of the thing.
OK, that is reasonable, but I would presume that when a return 'fax'
was to be sent it would be necessary to 're-synch' in the reverse
direction to compensate for delays.
- don
To the other poster, the article I have is of a
later
invention, but still massivly old. (Going to get it now)
John A.