working magnetic drum stores?

From: Tom Jennings <>
Date: Tue Mar 30 15:00:21 2004

On Fri, 26 Mar 2004, Peter C. Wallace wrote:

> Actually some drums have flying heads, Bryant at one time had drums with
> flying heads and a slightly conical drum, so that the drum could be lifted to
> approach the heads when the drum was up to "flying" speed...

LGP-21 fixed-head-platter mechanical memory (main store,
not "disk") the heads sit crashed (sic) and lift when up to
speed. The platter surface has fine scoring -- it's normal. It's
only 80 bits per inch. Nickel plated steel. In fact, there's
little springs that press the heads DOWNWARD.
Received on Tue Mar 30 2004 - 15:00:21 BST

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