Based on finding methane, at first glance.
My quick cleanup and curves adjustment. Since there’s no detail in the left side of his face or hands in the file available from Google, there wasn’t much to be done (I’m not up to that level of reconstruction).
The caption they have claims the instrument is something exotic, but it’s not; it’s a Spanish classical guitar.
I think I’m done spamming my own blog with stuff from there, at least for the next hour or so. I’m a bit disappointed at my inability to find anything on Heinlein or Asimov. But then they’ve only got about 20% of the collection digitised so far, so there may still be hope. I suppose I should start a post on things I’ve tried without finding anything.
The photographer and the other person are not credited.
Photo by Oscar G. Rejlander.
I think maybe that’s a lens Dodgson is polishing.
There are also a number of photos taken by Dodgson, including this one of the Rosetti family: