Analysis of information sources in references of the Wikipedia article "Dicycle" in English language version.
Left: The Otto Dicycle: 1870s. Designed by a Mr Otto and manufactured in the 1870s by the BSA company of Britain. Note the little wheel on a stalk at the rear to stop you falling over backwards. Presumably falling forwards was your own responsibility.
The dicycles cleared a grove of acacia trees, dodged termite mounds, and darted into a brushy thicket. They were not fast, but could cross rough and complicated landscape with ease
A velocipede having the two wheels parallel instead of in the same line
