I 33^ 1 



this plan, and that of one in common ufe of the 

 fame area, would be as 445 is to 702. 



It is needlefs to fay any thing of its mathema- 

 tical ftrength, as it muft be obvious to any one who 

 is at all acquainted with mechanics, that the pre- 

 fent figure is of all others the beft calculated to 

 anfwer that purpofe. 



I ^, &:c. 



HENRY DOBSON. 



Norwich, Sept. 23, 1785. 



[N. B. Mr. DoBSON writes, that the principal braces 

 in the model, which are put in by miftake three inches by 

 four inches, ought to be fix by four, and are fo accounted 

 in cubing the quantity of timber.] 



Article XLVIII. 



Oji Tranfphvtting and Dividing the Roots of Whe*t; 

 and of Harrowing, and Rolling the Crop. 



[In a Letter to the Secretary.] 



Sir, 



I HAD the pleafurc to be informed by your 

 letter of the loth inftant, that the Bath Society 

 had done me the honour of printing my obferva- 



tions 



