WEIGHTS AKD MEASURES. 36l 



which equals 11,520 cub. ft.; 11,520 divided by 400 equals 

 28 tons and 320 cub. ft., or 28f tons. The table on page 360 

 is from the American Agriculturist annual. 



The price per ton of 2000 lbs. being known, it is easy to 

 find the value of any fraction of a ton at $4 to $18 per ton. 

 If a farmer has 1565 lbs of hay on his wagon, and the dealer 

 has bought it at $7 per ton, he finds by looking across the 

 table from 1500 lbs. to the column at the top of which is $7, 

 that the value of 1500 lbs. at $7 is $5.25, the value of 60 lbs. 

 21 cents, and the value of 5 lbs. 2 cents, making a total of 

 $5.48. 



To find the value of any fraction of a ton at $7.40, $7.60, 

 $7.80, etc., find the value at $7 and add to it one tenth the 

 value at $4, $6, $8, etc. 



STRENGTH OF ROPES. 



Hemp rope, i in. in circumference, is calculated to sus- 

 tain a weight of 200 lbs.; i\ in., 450 lbs.; 2 in., 800 ?bs.; 

 i\ in., 1250 lbs.; 3 in., 1800 lbs.; 4 in., 3200 lbs.; 5 in., 5000 

 lbs.; 6 in., 7200 lbs. Hemp is considered twice as strong 

 as manila, and wire rope twice as strong as hemp. ( Year- 

 book U. S. Dept. Agric.) 



The diameters corresponding to the circumferences given 

 are, in the preceding order: .318, .477, .636, .795, .955, 

 1.27, 1.59, and 1. 91 inches. 



