I 



i'ith 



end 



half 

 allel 



iant 



'ght 



are 

 eof 



and 

 )ur;, 

 heir. 



'in 

 ilf( 







::;d 

 hof 



der, 



jea 



1 



the 



}er- 

 the 



1 



at- 



the 



\ 



THE DRILL PLOUGH. 



.60 





the top, to 

 them, as they rev 

 Fourthly. A fc 



prevent with certainty any of the grain from ftick 



■ew of iron about three inches long, with a fq 



head 



receive 



fcrew-d 



pafs through th 



Fig. 4 



d A of the 

 The fcrew part 



of this IS to lie in a nouo\^ j^i , . , . r._j ^^ tUp. woode 



received 

 cyUnder 

 A of the tin cyUnd 



female fcrew, which 



fixed to the wooden 



th:; Id a^t of the fcrew, which paiTes through the end 



muft have a (houlder withm the tin cy- 



it ; and a 



under, that it may not come forwards through the end of 

 brafs rin. mud be put over the fquare end of h fc w on h 



fide of the tin cylinder, with a pin 

 fcrew to hold on the brafs ring 



that fq 



end of the 



' - 



Thus when th 



driver 



radually moves 



inch on the wood 



fquare head of the fcrew is turned by a fcrew 



the tin cylinder backwards and forward 

 fo as either to prefs the end A of th 



thnder into contaa with the end of the wooden cylinder with 



viiiju*.! . ..« r • „u fr/^m it_ and leave 



remove it to the diftance of one inch from 



and leave a 



it, or to remove it lo uic uiitaw^^ 



^°'S: "xt r^of all the holes of the tin cylinder, which 



Fi/thfy 



[he end A of it, are now to be enlarged by flitting th 



each fide of the hole 



and 



three ei<^hths of an inch towards A. 

 h n that part of the tin, included between thefe two fl.ts wh.ch w.U 

 be half an'inch wide, and three eighths of an u>ch lengthways m r - 

 fpea to the cylinder, is not to be cut out, but to be bent down mto 

 the excavations of the wooden cylinder beneath, fo as to he aga.nft 

 that end of the excavation which is next to A 



But thefe projedin 



bits of 



before they are bent dow 



muft be filed a little 



fs 



the excavations of the wooden cylinder, 



the pro ea .- end, which is to be bent down, than at the other end 



tnc projccvuit, «-w^5 _ i:„j^. .r« ^r^ K^ rcither narroW( 



th 



e 



of the wooden cylinder are to be rath 



4H 



at 



