MEASURING LUMBER IN THE LOG 33 



5. Determine the cost, at $1.75 per hundred, of the lumber 

 required to build a yard fence 168 ft. long and 6 boards high, 

 the boards used being 12 ft. long, 4 in. wide, and 1 in. thick. 



6. At $2 per hundred, what will be the cost of the lumber 

 required to inclose a field 20 rd. square with a board fence 

 6 boards high, if the boards are 10 ft. long, 4 in. wide, and 1 in. 

 thick ? 



MEASURING LUMBER IN THE LOG 



35. A widely used rule for measuring lumber in the log 

 is the following, known as Doyle's Rule : 



36. Rule. Subtract 4 in. from the smallest diameter, -mul- 

 tiply the remainder by one half itself, then by the length of 

 the Joe/ in feet } and divide by 8. 



LOG 



EXAMPLE. How many feet of lumber in a log 12 ft. long and 32 in. 

 in diameter ? 73 



EXERCISE 



1. Determine the number of board feet in the following: 

 3 logs 14 ft. long, 36 in. in diameter ; 2 logs 16 ft. long, 

 24 in. in diameter. 



2. At 50$ per hundred for sawing, what will it cost to 

 have sawed 10 logs, 16 ft. long and 18 in. in diameter ? 



3. An oak tree 11 in. in diameter contains about 40 ft. of 

 lumber. After a growth of 8 yr. it contains 120 ft. At $1 



