"S. H. Roper, of Roxbury, Mass., constructed a steam-operated velocipede... (pl. 4, a) [which] appeared in the late 1860's at fairs and circuses in New England. Resembling a Hanlon-type velocipede, with wooden wheels and iron-band tires, the machine was propelled through the rear wheel... axle... fitted with cranks connected to two small steam cylinders, one on each side of the rear section of the frame."