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