A reciprocating-knife mower patented in December 1870 by A.J. Ohmer of Hamilton, Ohio, USA. This consisted of a wheel-driven cutter-bar to which a pole handle was attached. The machine was advertised as being available in 14, 16 & 18 inch sizes, the latter intended for side-draft operation by a pony. The smallest machine weighed 16lbs and the largest 30lbs.