SCREW ADJUSTING PLOUGH. 299 



to the horses, and has not wanted the usual repairs, which 

 the common ploughs are subject to, I make this observa- 

 tion from having had one in use for more than a year ; and 

 I find this plough much approved of by the farmers in this 

 neighbourhood. 



1 remain. Dear Sir, 



Your most obedient Servant, 

 Milton-ConstahU, May 3, IdlO. J. H. ASTLEY. 



SIR, 



The enclosed certificates will, I hope, be satisfactory to Advantages of 

 the Society respecting my plough. It is a material improve- * i? ° 8 • 

 ment over the wheel-ploui^h in commoa use in Norfolk, as 

 it works with greater ease to the horses, on account of the 

 line of draught being on a line with the angle of the horse's 

 shoulders. It lays the furrow-slice particularly level, and 

 cuts an even bottom-furrow. It is less liable to wear, on 

 account of having less friction on the ground irons. It is 

 particularly well calculated for breaking up stiff old land, 

 and less liable to be put out rtf order than any plough ge- 

 nerally used. By the adjusting screw, the furrow may be 

 set from one to nine inches in depth, and secured by a lock 

 to any of those intern^ediate depths with the greatest exactr 

 ness. It may b& easily converted into a swing-plough, by 

 disengaging the axle-tree and wheels. Its beam may be 

 mad^ particularly light, on account of the hue of draught 

 lying so near the heel. I beg leave to inform the Societ}', 

 that the Earl of Thanet, in the year 1807, ordered two of 

 these ploughs, and in 18Q9 six more of them. Mr. Bur- Misuse adopted 

 roughs, of Weasenhara, intends to have all his ploughs on - ^^^^^* • 

 this plan; also Mr. Wall, of Bayfield-lodge ; Mr. Cobon, 

 of Leatheringsett, will have two ploughs; and the Rev. T. 

 Munoings has given orders for some to be made. 



If I had not been so limited in time, I could have sent 



yoi? m-^ny more certificates, 



I am. Sir, 



Your most obedient humble Servant, 



THOMAS BALLS. 



Scxiingham, May 6, IS 10. 



Certificates 



