British Agricultural Revolution far apart. Alternately seeds could be laboriously planted one by one using a hoe and/or a shovel. Cutting down on wasted seed was important because the yield of seeds harvested to seeds planted at that time was around four or five. The seed drill was introduced from China to Italy in the mid-16th century where it was patented by the Venetian Senate. Jethro Tull invented an improved seed drill in 1701. It was a mechanical seeder which distributed seeds evenly across a plot of land and at the correct depth. Tull's seed drill was very expensive and fragile and therefore
Drill hub that are turned to move the spindle and chuck vertically. A drill press is typically measured by its "swing", calculated as twice the distance from the center of the chuck to the closest edge of the column. Thus, a tool with 4" between chuck center and column edge is described as an 8" drill press. A drill press has a number of advantages over a hand-held drill: For most drill presses—especially those meant for woodworking or home use—speed change is achieved by manually moving a belt across a stepped pulley arrangement. Some drill presses add a third stepped pulley