APPENDIX. 421 



The Ends of the Piece A, which guide the Harrow, 

 appear behind the Plank at//. Atg in the Harrow- 

 head is a Hole exactly in the Middle between the 

 Tines, for tying on a Stone when the Harrow is too 

 light for the Soil. Note, This Hole muft follow ex- 

 actly after the Middle of the Plank, i. e. between the 

 Two Shares at an equal Diflance from each. 



Obferve, that the Legs of this Harrow go thro* 

 the Head on the Outfides of the Tines, as in the 

 treble Drill they go thro' on the Infide of the Tines. 

 Inftead of the wooden Tines, may be put in com- 

 mon Iron Tines of a proper Length. 



The Two Hooks whereby the Plough is drawn are 

 at h h. 'Tis bed for the Ends of the Hooks to turn 

 upwards, fo that the Links of the Chain-traces, that 

 are to be put on them, may not be apt to drop 

 off. Take care that thefe Traces be of an equal 

 Length, which may be eafily made even by the Links 

 that are put on thefe Hooks. 



Note, The Links of the Piece of Chain, whereby 

 the Plough is made to go deeper or fhallower, may 

 be very fmall, and by no means in the Proportion 

 they bear to the Limbers in the Cut. There need not 

 be above Four or Five Links. If there be occafion 

 to raife or fink the Limbers more than that Number 

 will reach, the Cord may be tied longer or fhorter on 

 the other Limber. And when there is not the Con- 

 venience of Chain-traces, they may be fupplied by a 

 few Iron Links at the Ends of Hempen Traces. 



Fig. 10. is the Shape of a wooden Wreath, which 

 (when the Shares ftand wider afunder, or when there 

 are more than Two of them, fo that they come nearer 

 to the Ends of the Plank, this Wreath) is neceffary to 

 be put on the Spindle, the End a bearing againft-the 

 Infide of the double Standards, and the End b being 

 towards the Hopper. 'Tis fixt to the Spindle by the 

 Screw c, which mould not enter the Spindle above 

 half an Inch deep. There may be another like Screw 

 E e 3 to 



