( 59 ) 
of some kind of heavy wood, that they may operate 
as a counter-weight to the head, ahs soc and the 
mouldboard. | 
- Tothese remarks we subjoin two sets of experi- 
ments, made with the most approved French and 
English ploughs—that of Guillaume and Small’s 
Rotheram ploug gh improved, which furnish a. means 
of comparison between the best ploughs of Europe 
and those of this country. 
The resistance (stated in these tables) was mea- 
sured and ascertained by a dynonometer, a machine 
indispensable to those who would make correct ob- 
servations on the relative advantages of. different 
ploughs. 
THE FRENCH PLOUGH. THE ENGLISH PLOUGH. 
Resistance in pounds. _ Resistance in pounds. 
ist experiment, . 200 _ Ist experiment, 360 
2d do. 240 2d do. 380 
BE. Pin AQ: 200. 3d do... . 480 
Ath . do. (220. 4th do. 460 
5th do. 220 Sth do. 400 
| : —- 6th — do. 400 
Divided by 5) 1080 7th do, 420 
—— 68th .§ do. . 386 
Average, 216 9th do. 410 
Divided by 9.) 3720 
Average, 413 
Ul. The Harrow. This is of different kinds—the 
triangular and the square, the single and the dou- 
