Mile Ohm

—In telephone and practice, the weight of a piece of wire one mile long having a resistance of one ohm, The poorer the conductor the greater the weight of the mile ohm, hence the weight per mile-ohm is a convenient way of expre ing the electric conductivity of wires. To ascertain the mileage resistance of any divide the weight per mile ohm, by th the wire per mile. The weights per mile ohm different grades of line wire are as follows: wire, about 5700 lbs.; E. B. B. wire, about 500 lbs.; steel wire, about 6500 Ibs. The approximate weights per mile sizes of galvanized telegraph wire are No. (Trenton gauge)| 4 5 é Lbs,per mile 720 |610 |525 |4501375. No. (Trenton gauge) 9 10 11 Lbs., per mile 310 | 250 | 200 | 160 }