-------------------------------+-------------+-------------+ | 37/10 | Two Sets. | | | 37/10 | -------------------------------+-------------+-------------+ Area, square inches | 0·5 | 1·0 | Area, square millimetres | 322 | 645 | Weight per 100 yards run lb. | 1153 | 2306 | Cost of copper at 7¾_d._ | 37 5 0 | 74 10 0 | Cost of insulation | 70 15 0 | 141 10 0 | +-------------+-------------+ Total cost of Cables | 108 0 0 | 216 0 0 | Casing, bitumen, and cement | 16 0 0 | 22 0 0 | Labour, Laying | 10 0 0 | 18 0 0 | Trenching and repairing | 25 0 0 | 25 0 0 | Surface boxes and connection | 10 0 0 | 10 0 0 | Engineer and superintendent | 10 0 0 | 10 0 0 | +-------------+-------------+ Total | 179 0 0 | 301 0 0 | Add extra if copper, at | | | 9½_d._ | 8 10 0 | 17 0 0 | +-------------+-------------+ | 187 10 0 | 318 0 0 | Cost of copper per lb., | | | laid complete | 0 3 3½ | 0 2 8¾ | Current in ampères | 180 | 360 | Cost per ampère | 1 1 0 | 0 17 6 | -------------------------------+-------------+-------------+