The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

STRENGTH OF TELEGRAPH WIRES. 523
Table 8.
WEIGHT AND MEASUREMENT OF ENGLISH WIRE.
No. of feet per lb. Birmingham Yards per cwt.
Ft. in. Gauge. about
No. 1........... 4 3................. 140 galvanized.
2........... 5...................... 170 "
3........... 6....................... 210
4....7.... 15 240 "
4...... 7........... 7........... 240.
5................. 8'............ 275 44
6... 9 6........ J9 320 "l
7...........12...................... 400 "
8...........13 6...........,. 450 "
~9....1~6 6......o.550..
9...........21 6,............ 730 4
11...........28....................... 950
10...........33.21..................... 730
11...........41......................1,420'9
14........33.............. 115900 c
15...........66........... 1........... 2 300
16...........90........... 3...........3100
17...........17 7..........................4,000 "
18...........16 2......................... 5,200 "
19...........22 2......................... 7,000
20...........33 1.........................10,500 "