[ 75 ] 



N.B. The rocking tree is not delineated in No, l| 

 In order that the plan of the frame may be more 

 cafily underftood, 



L. L. No. I, 2; 3, are weights of frec-ftonc, 

 s6 inches long, fix inches broad, the under one 

 four inches thick, the upper one of the fame dimen- 

 fions, and three inches thick, which will weigh (ac* 

 cording to the gravity of the ftone) about four 

 flone the under, and three the upper, all of them 

 having two holes in them, thro' which iron fpikes, 

 firmly fixed in the bulls, pafs, in order to keep 

 them fteady. 



When the ground is eafily cut, the under flone, 

 of four ftone weight may an/wer 5 when more dif- 

 ficult, the other ftone of three ftone weight may be 

 added, fo that every wheel may have feven ftone 

 weight upon it, which has been found fufficient for 

 ^he ftifFeft land and taugheft fward the machine has 

 ^ver been tried on. Caft-iron weights will anfwer 

 fully better, but are more expenfive, which die in^ 

 ventor wiflies by all means to avoid. 



The lever I. No. a, 3, which ought to be fivi 

 feet long, muft have a Aiding rope on it, fixed to 

 the back part of the frame, fo that when the cutting 

 wheels aie all taken out of the ground three or foiir 



JAches, 



