Editing Threshing (section)

==Mechanization==
In the 18th century there were efforts to create a power-driven threshing machine. In 1732 Michael Menzies, a [[Scottish people|Scot]], obtained a patent for a power-driven machine. This was arranged to drive a large number of flails operated by water power, but was not particularly successful. The first practical effort leading in the right direction was made by a Scottish farmer named Leckie about 1758. He invented what was described as a "rotary machine consisting of a set of cross arms attached to a horizontal shaft and enclosed in a cylindrical case." This machine did not work very well, but it demonstrated the superiority of the rotary motion and pointed to the ways in which thrashing machines should be constructed.{{sfn|McConnell|1911|p=887}}

True [[industrialization]] of threshing began in 1786 with the invention of the [[threshing machine]] by Scot [[Andrew Meikle]].  In this the loosened sheaves were fed, [[Ear (botany)|ears]] first, from a feeding board between two fluted revolving rollers to the beating cylinder. This cylinder or "drum" was armed with four iron-shod beaters or spars of wood parallel to its axle, and these striking the ears of corn as they protruded from the rollers knocked out the grain. The drum revolved at 200 to 250 revolutions per minute and carried the loose grain and straw on to a concave sieve beneath another revolving drum or rake with pegs which rubbed the straw on to the concave and caused the grain and chaff to fall through. Another revolving rake tossed the straw out of the machine. The straw thus passing under one peg drum and over the next was subjected to a thorough rubbing and tossing which separated the grain and chaff from it. These fell on to the floor beneath, ready for winnowing.{{sfn|McConnell|1911|p=887}}

A later development of the beater-drum was to fix iron pegs on the framework, and thus was evolved the Scottish "peg-mill," which remained the standard type for nearly a hundred years, and was adopted across the US.{{sfn|McConnell|1911|p=887}} In Britain, the development of high-speed drums carried considerable risk, and a type of safety guard was mandated by the Threshing Machine Act of 1878.{{sfn|McConnell|1911|p=887}}