Plane of core memory

dwight dkelvey at
Thu Apr 18 11:59:56 CDT 2019

My understanding was that the mercury delay lines needed periodic repairs ( not sure what the cause was but mercury does dissolve into many metals ). If I were going to make a delay line memory, I'd go with the magnetostrictive. These are practical to make. One just needs a little ingenuity and a spool of piano wire.

From: cctalk <cctalk-bounces at> on behalf of Al Kossow via cctalk <cctalk at>
Sent: Thursday, April 18, 2019 9:42 AM
To: cctalk at
Subject: Re: Plane of core memory

On 4/18/19 9:30 AM, Chuck Guzis via cctalk wrote:

> Anyone with a Williams tube project?

The 1401 guys at CHM were working on one using a real 701 tube.
I don't think it was ever finished.

@tubetimeus built a small core array with Bulgarian cores

Discussion of the EDSAC rebuild

Haven't heard if anyone has tried to get one of the Russian MR
lines on eBay to do anything, or if anyone has a running Packard-Bell PB-250

More information about the cctalk mailing list