[time-nuts] The home time-lab

Francis Grosz fgrosz at otiengineering.com
Tue Jul 26 13:01:47 EDT 2016


     IIRC, the IBM 360 mod 91 was one that used a MG set.  I think it also
required chilled distilled water for cooling.  Those were indeed the
days of "Big Iron".

         Francis Grosz

>Date: Mon, 25 Jul 2016 21:04:58 -0700
>From: jimlux <jimlux at earthlink.net>
>To: time-nuts at febo.com
>Subject: Re: [time-nuts] The home time-lab
>Message-ID: <ec93c0e5-8f49-05e3-7042-917c179d594d at earthlink.net>
>Content-Type: text/plain; charset=utf-8; format=flowed

>On 7/25/16 6:55 AM, Bob Camp wrote:
> Hi
> If you go back far enough in time 
. there is another alternative:
>        Big rectifier bank, turning AC into DC, often off of multiple
phases or sources.
>        Big DC motor running into a fairly large flywheel.
>        AC generator (or in some cases DC generators) running off of the
>        A tuning fork (yes state of the art timing) based control on the
AC output frequency
>        A saturated reactor control loop on the generator side, same
thing on the motor side.
> Wonderfull stuff. State of the art UPS for your shipboard computer in
1962. Ear muffs anyone?
> Bob

>we had a system like this to turn 60 Hz into 50 Hz with a toothed belt
>drive between synchronous motor and synchronous generator.  It whined..
>"Satan's Siren" is what we called it.
>IBM mainframes used a similar scheme but I can't remember the details.

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