APPENDIX. 417 



fquare Holes c c behind them, for their Funnels to 

 (land on. Make the Mortife e, which is to hold the 

 fingle Standard that is to hold up the fore Hopper in 

 the treble Drill, and in this to guide the Wheels alio, 

 inftead of Wreaths, that in the treble Drill are put on 

 the Spindle bearing againft the Infides of the double 

 Standards-, for in this the Shares being but Ten Inches 

 afunder, and at fuch a Diftance from each of the 

 Wheels, that neither of them doth by rifing lift up a 

 Share perceptibly; but if the Shares were wide afun- 

 der, or there were more of them reaching nearer to 

 the Ends of the Plank, a Wheel might rife up, and 

 lift a Share out of the Ground, if guided by the fingle 

 Standard and Hopper, as in this. The fingle Standard 

 is fhewn in Plate 4. Fig. 10. but this has no Fork 

 at its Bottom, as that has. This has only a fingle 

 Tenon, and is mouldered before, behind, and on each 

 Side, to hold it the more firm and Heady, when tightly 

 pinned down by Two Pins underneath the Plank. The 

 Dimenfions of this Standard are the fame with thofe 

 of the other •, but the Shou-lders muft not increafe the 

 Thicknefs of the Standard any higher than the Tops 

 of the Funnels. 



The Four other fquare Holes, viz. f with another 

 behind it, and g with one before it, are tor thQ 

 double Standards, which are to be well mouldered, 

 or braced on the Side of each that is next to the 

 End of the Plank, and on theOutfide. There is no 

 need of Shoulder or Brace on the Sides where the 

 Spindle is placed, or on the Side next to the Middle 

 of the Plank. 



The Four round Holes b i k I are thofe thro* 

 which the Four Pins pafs that hold on the Limbers, 

 and the Piece A, in Fig. 2. and the other of the 

 fame Sort in Fig, 4. 



Fig. 2. and 4. fhew how the Harrow's Leg B is 

 held to the Piece A, by the Pin C. The Letters a b 

 Ihew the Holes through which the Pins do pafs to 



E e fcrew 



