WEIGHTS AND MEASURES. 



399 



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 6olbs. 

 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 HEMP ROPES. 



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

 tain a weight of 200 lbs.; i^ in., 450 lbs.; 2 in., 800 lbs.; 

 2^ 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. ( y^ear- 

 book U. S. Dept. Agrir.) 



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. 



THE STRENGTH OF MANILA ANH WIRE ROPES. 



(Cornell Univ.) 



