IBM ScanMaster

From: Don Maslin <donm_at_cts.com>
Date: Wed Apr 4 23:40:32 2001

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.
>
>
Received on Wed Apr 04 2001 - 23:40:32 BST