APPENDIX. 419 



Thefe Three Parts are grafted together by HeJp of 

 the hollow Cylinder Fig. 6. which, being put on upon 

 the Joint/, of the Spindle F/g - . 5. holds the Parts A 

 and B together by the Two Pins a a, paffing through 

 the Cylinder near its Ends, and through the Holes 

 k and g. 



This Joint may be in another manner •, viz. One 

 Part of the Spindle may enter into the other by cut- 

 ting it to a fquare Peg of an Inch long, and 3«4ths 

 Diameter, entering an Hole that fits it, at the End 

 of the other Part. 



Thefe Pins will be beft to have Screws at their 

 Ends with Nuts to them ; and then they need not be 

 io tight in the Holes, and may be the more eafily 

 taken out, when the Part B is to be taken off for 

 avoiding Obftructions in drilling an outfide Ridge. 



The Cylinder is a Foot long, and about half an 

 Inch thick, bound with an Iron Ferrel at each End ; 

 and if there were another in the Middle, it might be 

 the ftronger. 



Place the Cylinder on the Outfide of the Spindle, 

 the Joint/ being exactly againft the Middle of the 

 Cylinder -, and mark at each End of it, in order to 

 fee when it is in its right Place-, and after it is put on 

 and pinned, mark likewife on the Spindle the exact 

 Places of the Holes, for the more eafy finding them 

 every Time the Cylinder is put on. 



Another Cylinder muft be on the Joint r, held to- 

 gether by Pins pafiing thro* the Holes i and d, in the 

 fame manner, and for the fame Purpofe, as the other 

 Joint already defcribed. 



The Spindle ought to be of equal Diameter with 

 the Bore of the Seed-boxes, thro* which it is to pais; 

 but this I find, needs not be quite an Inch and 3-4ths ; 

 it may want an 8th of it, even in this long Spindle. 



Fig. 7. is one of the Pins which hold the Cylinder 



in its Place, as has been faid •, a is its Head ; b the 



Stalk, which would be better to be a Screw at its 



E e 2 lower 



