Editing Jethro Tull (agriculturist) (section)

===Drill husbandry===
[[File:Jethro Tull seed drill (1762).png|thumb|upright|Tull's Seed drill (Horse-hoeing husbandry, 4th edition, 1762<ref>{{Cite book |url=https://archive.org/details/horsehoeinghusba00tull |title=Horse-hoeing husbandry |edition=4th |date=1762 |author=Tull, Jethro |others=Adams, John, 1735–1826, former owner |publisher=London: Printed for A. Millar.}}</ref>)|alt=]]
Tull invented some machinery for the purpose of carrying out his system of drill husbandry, about 1733. His first invention was a drill-plough to sow wheat and turnip seed in drills, three rows at a time. There were two boxes for the seed, and these, with the coulters, were placed one set behind the other, so that two sorts of seed might be sown at the same time. A harrow to cover in the seed was attached behind.<ref name="CWJ 1844 p. 419">"Drill Husbandry" in: ''The Farmer's Encyclopædia, and Dictionary of Rural Affairs'', by Cuthbert W. Johnson, 1844, p. 419.</ref>

Tull also invented a turnip-drill somewhat similar to the other in general arrangement, but of lighter construction. The feeding spout was so arranged as to carry one half of the seed backwards after the earth had fallen into the channel; a harrow was pinned to the beam; and by this arrangement one half of the seed would spring up sooner than the other, allowing part to escape the [[Delia radicum|turnip fly]].<ref name="CWJ 1844 p. 419"/>

When desirable to turn the machine, the harrow was to be lifted and the feeding would stop. The manner of delivering the seeds to the funnels in both the above drills was by notched barrels, and Tull was the first to use cavities in the surfaces of solid cylinders for the feeding. Nothing material in the history of the drill then occurred until 1782.<ref name="CWJ 1844 p. 419"/>