The concept was picked up by a number of British cartwrights; the most notable was Denis Johnson of London announcing in late 1818 that he would sell an improved model. New names were introduced when Johnson patented his machine “pedestrian curricle” or “velocipede,” but the public preferred nicknames like “hobby-horse,” after the children's toy or, worse still, “dandyhorse,” after the foppish men who often rode them. Johnson's machine was an improvement on Drais's, being notably more elegant: his wooden frame had a serpentine shape instead of Drais's straight one, allowing the use of larger wheels without raising the rider's seat, but was still the same design.