Wow, glad you linked to this in heliopausa's recent post. What a fascinating discussion! Not only are the examples people turn up interesting, but your thoughts on what fits with in the rubric you're setting up. I agree that stories like The Time Machine are more about imagining the future, or critiquing the present from the future (Bellamy's Looking Backward (https://en.wikipedia.org/wiki/Looking_Backward) is an example too, from 1888.) And then--I haven't read all the threads and subthreads, so maybe you've talked about this in one but--there's whether a person actually goes to the past, or merely has a dream or vision. Those sorts of stories seem, to my mind, to sit between time travel and historical fiction (i.e., a story that takes place in the past).