Industrial Revolution sectors of the economy. However, per-capita food supply in Europe was stagnant or declining and did not improve in some parts of Europe until the late 18th century. Industrial technologies that affected farming included the seed drill, the Dutch plough, which contained iron parts, and the threshing machine. Jethro Tull invented an improved seed drill in 1701. It was a mechanical seeder which distributed seeds evenly across a plot of land and planted them at the correct depth. This was important because the yield of seeds harvested to seeds planted at that time was around four or five. Tull's seed
Drill instructor recruits who fail parts of the course. The sergeant carries a pace stick as a badge of office during parades. In the British Army, the appointment of Drill Sergeant (DSgt) is limited to the five Foot Guards regiments, the Honourable Artillery Company (HAC), Infantry Training Centre Catterick, London District, and the All-Arms Drill Wing (part of the Army School of Ceremonial, Catterick). Drill Sergeants hold the rank of Warrant Officer Class 2. However, any senior NCO conducting drill can be colloquially referred to as a "drill sergeant". There are two Drill Sergeants per battalion (one in the HAC) and they