|Ansel Adams' Darkroom Scale - Monterey County 1987|
I took this at Adams' house during a workshop in 1987. Adams died in 1984, but his darkroom stuff hadn't been disturbed when I was there. So: a scale, an acid joke, and various technical data.
The joke, of course, is that the chemical processing of films and prints requires copious amounts of acid.
I had similar technical charts mounted on my darkroom wall during the film years. Oh wait . . . the HC110 developing instructions are still on the wall. Oops.