I always forget that TUHS can't handle pictures. Perhaps Warren will let my
post through, but in any case here's a link to the mail, reformatted but
otherwise intact, with photos, on Mastodon.
https://hachyderm.io/@robpike/113322062117546253
To pique your interest, here's the first paragraph.
*In August 1981 we had a persistent problem with the RP06 on our PDP-11/70
crashing disks. It even crashed once while the DEC repairman was standing
next to it trying to figure out why the previous pack had died. We
collected a few dead packs, and they were forming a pile. Lillian, never
one to miss an opportunity, suggested building a mobile.*
-rob