I was looking for evocative diagrams of steam-powered things to decorate Julian’s walls, and I came across the von Sauerbronn-Davis steam velocipede of 1883. [Not sure why it’s termed a velocipede, incidentally, as a velocipede, by definition, runs on human power created by pedal pushing. There are no pedals on that thing.]
The von Sauerbronn-Davis machine looks like a bad idea on wheels, especially with the user’s seat directly over the freakin’ boiler! Nevertheless, the design, with two large wheels in front and the smaller swiveling wheel in the back, appeals to me. Therefore I will be constructing Julian’s steampunk power chair in the same style, but with much smaller tires and a much cushier seat.