Research: I've Googled "history of wheelchairs" and some variations, and read the Wikipedia article on wheelchairs.
My character is a wealthy young man in his twenties who was crippled in a fall when he was a teenager and is unable to walk. I've discovered that wheelchairs did exist in the late nineteenth century, but I have not found any details.
First of all, how might he get around town? Would his chair be able to fit into a standard cab or carriage, or would he need to make special arrangements? Also, would wheelchairs of the time be light enough that a rather athletic man could carry one (unoccupied) up a flight of stairs?
Money is no obstacle for the character.
Any other information people may have regarding the topic would be greatly helpful.