drill husbandry

Agric.: The system of sowing seeds in drills. drill-jar, s . A form of stone or well-boring tool in which the tool-holder is lifted and dropped succe ively. The drill-rod is raised sufficiently between each impulse to loosen the tool from its impre ion in the stone, and is then dropped to give a blow to the tool. The tool-shank screws into the socket at the lower end of the piece.