C 37 3 



'/ In the next twelve years,' (af^i^ii' years of age) 

 a third foot is added to the length of tiie fhaft, and 

 it becomes 2 1 inches girt ; its contents then will be 

 >j tons, iirfeet, 8 inches, and the four branches 

 mdi become meafgrable, four feet in length, and 

 girt nine inches, confequently will contain 3 tons> 



ao feet, 8 inches. 



/ft I- • 



The next twelve years, (when 1^3 years of age) 

 by acquiring another foot of fhalft, with a girt in* 

 crealed to 24 inches, it will contain 4 tons, 16 feet, 

 and the four branches will be meafurable, fix feet 

 in length, at 10 inches girt, containing 16 f. 8 in, 

 making in all 4 tons, 32 feet, 8 inches. 



We will now allbw 13 years for a like addition 

 to the length and girt of the fliaft, which (at 136 

 years of age) will then be 45 feet by 27 inches, 

 equal to 5 tons, 27 feet, 9 inches ^ the four branches 

 will be meafurable nine feet in length, and girt 

 1 1 inches, equal to 30 feet, 4 inches s together will 

 containing 6 tons, 1 8 feet, i inch, 



Laftly, we will take 14 years to fupply kn ad- 

 ditional foot to the length, and three additional in- 

 ches to the girt of the fhaft ;• which will then be 

 46 feet long by 30 inches girt, equal to feven tons, 



D 3 fcven 



