(aka: The Return of the Time Machine)
Die Ruckkehr der Zeitmaschine by Egon Friedell was the first direct sequel. It dwells heavily on the technical details of the machine and the time-paradoxes it might cause when the time machine was used to to visit the past. The 24,000-word German original was translated into English by Eddy C. Bertin in the 1940s and eventually published as a paperback as The Return of the Time Machine Sequel to H. G. Wells' The Time Machine'.
Publication history in print:
- Die Ruckkehr der Zeitmaschine (aka: The Return of the Time Machine) (published by Unknown Publisher in 1946)