57. Without actual knowledge, the thing by the battery seems to be a small reciprocating engine (per a reverse image search). I don't know what purpose that would have in this context, but perhaps something to do with moving the electrical current through the experiment.

48. Iceboxes! This one looks like a chest freezer, which is not what the ones shown on Wikipedia are like, but whatever. Traditional kitchen iceboxes were used from the mid-19th century through to home refrigerators in the 1930s. 1827 saw the commercial ice cutter invented, which made things easier.

35.2. Connected to the pain is the symbolism of the creature's stance with the dynamite, which sent me directly back to Elizabeth's comment about martyrdom paintings. The resignation of knowing it's going to hurt, a lot, but won't kill him, is so powerful.