vac tubes / was Re: Schematics of Atanasoff-Berry

Ethan Dicks ethan.dicks at
Fri Sep 5 07:00:21 CDT 2008

On Fri, Sep 05, 2008 at 12:19:33PM +0100, Gordon J. C. Pearce wrote:
> On Thu, 2008-09-04 at 17:16 -0400, Patrick Finnegan wrote:
> > They're about the only company I know of that takes a 1900lb rack of 
> > machines, and then puts another 200lbs of steel plates on the bottom to 
> > add weight. (IBM SP frames)
> > 
> > Now that I think about it, I'm surprised that I don't yet have a bad 
> > back thanks to my IBM gear.
> Of course, having 100kg of ballast in the bottom does give you the
> rather handy feature of making the rack not tip over and kill you when
> you pull a machine at the top...

I've seen plenty of DEC cabinets with a couple hundred pounds of
counterweight in the bottom _plus_ anti-tip feet.  Fortunately, I've
never had the pleasure of one tipping over on me, so I can understand
why they do it.

The closest I've personally experienced was trying to extract an 11/750
out of a minivan solo.  I managed not to crush me or crunch the CPU, but
it was tough.

I _really_ don't want an SA482 cab falling on top of me.


Ethan Dicks, A-333-S     Current South Pole Weather at  5-Sep-2008 at 11:50 Z
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Ethan.Dicks at  

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