4i8 APPENDIX. 



fcrew the Piece A up to the Plank, and the Limbers 

 for guiding the Harrow. This Piece A is fomewhaC 

 longer than the Breadth of the Plank •, it is about 

 Two Inches thick, and Two and an half in Depth, 

 The Pin Fig. 3. goes through this Piece near the 

 Bottom of its fore End, whereby the Harrow tines 

 have the more room to rife up, without being held 

 down by the Legs prefling againfl: the Plank. 



Fig. 3: is the Pin C, of Fig. 2. a is its Head, b 

 its round Part, whereon the Harrow moves ; c is its 

 fquare Part, that prevents its turning, which by the 

 Motion of the Harrow would unfcrew the Nut d, and 

 caufe it to come off of the Screw e 9 and be loft. 



The Harrow is alfo fhewn in Fig. 1. as it is guided 

 by the Pieces before defcribed : B is its Head, that 

 holds the Tines D D, drawn by the Legs C C. Tho* 

 thefe Legs in Piano feem in their Middle to crook 

 fideways, yet when out of Perfpective, their Middles 

 crook only downwards 5 which is to give the greater 

 Length to the Tines, and the more room for them to 

 move up. 



Fig. 5. is the Spindle in Three Parts . A is the mid- 

 dle Part, wherein are the Notches b b. This is bed 

 to be of Oak, or fome other hard Wood, in which 

 the Edges of the Notches are lefs apt to wear than in 

 fofter Wood ; but I have had a Set that have lafted 

 the Drilling of 120 Acres, when made of Aft. B 

 and C are the Two other Parts : D and E are their 

 Ends, whereon the Wheels are put. The Holes 

 h h h b 9 and the fame in the other End under the 

 Letter E, are for fetting the Wheels at different Dis- 

 tances, in order for making new Notches, or for dif* 

 ferent-fized Ridges : The Wheels are held in their 

 Places by long Nails put through fome of thefe 

 Holes, and clenched upon the Iron Stock-bonds to 

 prevent their falling out. Thefe Ends B and C need 

 not be cut to a Square ; except juft enough to pre- 

 vent the Wheels from turning on the Spindle. 



Thefe 



