40 A SYSTEM OF ACCURATE MEASUREMENT. 
VIII. —Table of Values for r in the Equation 7° — tr’ — ef = 0. 
6 1 ie yaee, t = 30. t = 35. jen Ge i 
chains Ib. Ib. Ib. Ib. Ib. Ib. 
1 27-22 30°68 34°50 38°59 42°91 47°38 
5 58°75 60°97 63°34 65°84 68°50 71-30 
10 88-42 90°42 92°51 94°67 96-93 99°27 
— TT ee t = 25. t = 30. ic. em 0. fn & 
chains Ib. Ib. Ib. Ib. Ib. Ib. 
1 26-97 29°59 33°56 87°81 42°94 46°83 
5 54°18 56-46 58°90 61°51 64-28 67-21 
10 81-06 83°10 85:23 87°46 89°77 92-20 
Nore.—w = 1ib. : k= 00000779 chain :7=1, 5, and 10. €=90° 
and 60°. 
This table may be peer a interpolating the tensions with any 
standard tension from 20 to 45 1b. for riband weighing 1 Ib. per 
chain. For riband of ste "oti weight the tension for both the 
supported and the suspended ribands will be proportionate, and 
may be found by multiplying the quantities in the table by the 
weight of 1 chain of the riband, expressed as a fraction of a pound. 
