My first post regards a mystery -- at least to me.
I purchased this object for a few £'s at a charity shop in Christchurch, England, because: 1) it clearly seemed to have something to do with photography, and 2) I had no idea what that might be.
It's made by Johnsons of Hendon, a firm, I understand, that was for many decades a major supplier of photography-related chemicals and equipment. But beyond that easily obtainable fact (the nameplate is on the front of the drawer), I have been unable to find out anything else about what this might have been used for.
Can anyone help shed light on this?
Arthur [Research Scientist (retired), Photographer (avocationally active), and Digital Artist (aspiring)]