Chap. XX. Of the Drill-Boxes. 329 



and are placed one above, and the other below, the 

 Setting-fcrew ; for otherwife that Screw, and its 

 Counter-fcrew, might force open the Joining of the 

 Box, and then the Setting-fcrew might be loofe, and 

 the Bevel of the Box might be altered ; but thefe 

 Screws, being one on each Side of it, prevent this 

 Inconvenience. 



Fig. 8. in Plate 2. is one Half of a Brafs Turnep 

 Seed-box, lying with its Infide uppermofr., which 

 fhews the left Side of the Mortife, and half the Fore- 

 end, and half the Hinder-end, of the Mortife, and 

 half of each Screw-pin Hole, by which it is held up 

 to the Bottom of the Hopper. A is half the Hole 

 of the Setting-fcrew, fhewing in the Middle of it 

 the End of the Counter-fcrew. B is half the Hole, 

 by which the Steel Spring-cover is held in with 3 

 Screw. All the other Holes are for the fame Pur- 

 pofes, as have been fhewn in the Wheat Seed-box. 



Fig. 9. is the whole Turnep Seed-box, Handing 

 upon its Bottom -, Part of [its Steel Spring-tongue 

 appears in its Place, as alfo fome of the Notches of 

 the Spindle ; but more efpecially the Cover A, which 

 differs from the Cover of the Wheat Mortife, this 

 being a very thin Spring, whofe lower End juft 

 reaches to touch (but not to bear upon) the Spindle 

 at the upper End of the tranfverfe Axes of the Ellip- 

 fes -, the Mortife being filed away at the End, in 

 order that the upper End of this Spring, and the 

 Screw which holds it, may not lie above the upper 

 Surface of the Box. This Spring is made very weak, 

 to the end that, if by any Chance a (oft Seed mould 

 {lick in a Notch, and be turned round, this Spring 

 might fuffer it to pafs by without breaking it. B, C, 

 are the Two Flanks or Sides, made neceffarily of this 

 Breadth, for bearing againft the Wood of the Bottom 

 of the Hopper, to prevent the Seed from falling out 

 betwixt the Wood and the Brafs, and that the Hole 

 in the Hopper may be broader than this narrow Mor- 

 tife 



