34- PEACTICAL MEASUREMENTS 



per hundred, what is the value of the growth of the oak in 

 50 A. of forest, averaging 30 oaks to the acre ? 



4. A poplar tree 10 in. in diameter contains about 46 ft. of 

 lumber. After a growth of 10 yr. it contains 200 ft. At $1.75 

 per hundred, what is the value of the growth on 400 trees ? 



5. Estimating one railroad tie to a tree 11 in. in diameter, 

 which is the better business : to cut 800 tie trees when ties 

 are selling at 55$ apiece, delivered, or to take the growth 

 on them for 12 yr., at which time the trees will average 

 170 ft. and will be 'worth $1.50 per hundred standing ? 



6. If a cubic foot of oak weighs 64 lb., what is the weight 

 upon a wagon loaded with 10 oak ties 8 \ ft. long, 9 in. wide, 

 and 7 in. thick ? 



7. How many railroad ties 9 in. wide, placed 15 in. apart, 

 are required for 1 mi. of track ? 



CORDWOOD, STOVE WOOD, AND COAL 



37. Cordwood is 4 ft. long. A cord of wood is a pile 8 ft. 

 long and 4 ft. high. A cord of stove wood is a pile of wood 

 8 ft. long, 4 ft. high, and of any length that will fit a stove. 



38. Rule. To find the number of cords of wood in a pile, 

 multiply the length of the pile by the height in feet, and 

 divide by 32. 



EXERCISE 



1. If a cord of wood for cooking purposes lasts a family 

 3 wk., how much does the family pay out in the course of a 

 year for cook-stove wood when wood is $2 per cord ? when 

 wood is $3 per cord ? 



2. How many cords of wood are there in a pile 18 ft. 

 long and 4 ft. high ? 



3. How many cords of oak bark are there in a pile 24 ft. 

 long and 10 ft. high ? 



