1717. The drill-rake has large coulter-formed teeth, about six inches long and the same distance apart: it is used for drawing drills across beds for receiving small seeds, and also serves to stir the soil between the rows after the seeds come up. In very loose soils, where a wide drill is required, a sheath of wood may be fixed to the upper part of each prong in order to spread the earth; but this is seldom necessary. When the drills are not to be quite so wide as six inches, the operator has only to work the implement diagonally. Fig. 351. shows a rake of this kind, invented by Mr. Ogle, which may be formed from a common hay rake.