On the Mensural Ion of Tbnber. e 2 1 



the diameter Bb : ia like manner let the tree be callipered 

 in the same place, but on the sides or in the directions Aa 

 and A a, and suppose them 22^ and 22]. Then say, by 

 the rule or" three, as 26 : 1 :: 22£ : -875: looking {'or this 

 number in the first column, we find the nearest number 

 thereto to be -8781018, and answering thereto in the se- 

 cond column is 1-25, (" l-4th increase/') showing that 

 the square measure of this tree is 1-25 times that of its round 

 measure, or l-4th part more; and by the third column it 

 appears that the price per load square measure sfu.-uld be 

 80-100dths or 8-10ths times that of the price of the same, 

 tree per load round measure, exclusive of the cost of hew- 

 ing, carnage, &c. Suppose, therefore, the price of. the tree 

 in question per load round measure to be 5l. 10s. or 5" 5, 

 this multiplied by *8 gives 4*4, or4l. 8s. for the price per 

 load square measure or when hewn. For another example : 

 suppose a tree callipered in the middle, on its angies or cor- 

 ners, gave 24 and 24 inches, then 24 inches is the diame- 

 ter Bb; and that the tree callipered in the same place on 

 its sides gave 19 and 18| inches; the half of the sum of 

 these being 18 J, or 18-875 inches, is the calliper Aa, then 

 as 24 : 1 : : 18*875 : : *786 : the nearest number to this in 

 column the first is '7853982, in which case it appears from 

 column the second that the round measure and square mea- 

 sure are equal, the calliper being equal to l-4th of the cir- 

 cumference or to the girt; the prices per load should not in 

 this case therefore vary. 



Suppose the price per load of hewn timber or of the square 

 measure to be given, and also the proportion which the 

 calliper bears to the diameter, or how many per cent, the 

 former is of the latter ; the second column will in that case 

 give the proportionate price of the same timber round mea- 

 sure : thus, if hewn timber measured by callipering it be at 

 7l. 2s. 6d., or in decimals 7*125 pounds per load; that the 

 cost of hewing and carriage is 2l. Os. 6d. or 2*025 pounds 

 per load ; the difference of these or the net price being 5'1 

 pounds, and that it be. so hewn that the calliper A a is QO 

 percent, or 90-l00dths of the diameter Bb: looking for 

 *90 in the first column of the table, I find against it in the 

 second column 1*313122, which multiplied by 5-1 gives 

 6-097 pounds, or 61. 13s. lljd., the price which this 

 timber ought, independent of profit, to have borne at the 

 place of its growth when round and measured by girting it. 

 A gentleman or his agent having oak timber to dispose of, 

 and being unacquainted with the difference of measures, if 

 offered 5l. 2 s. per load by a timber dealer, who stated at 



the 



