Ground Attachment Harrow
In agriculture, a set of harrows is an implement for cultivating the surface of the soil. In this way it is distinct in its effect from the plough, which is used for deeper cultivation. Harrowing is often carried out on fields to follow the rough finish left by ploughing operations. The purpose of this harrowing is generally to break up clods and lumps of soil and to provide a finer finish, and a good soil structure that is suitable for seeding and planting operations. Coarser harrowing is used to remove weeds and to cover seeds after sowing.
Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)