-------------------------------+--------+---------+ | 19/12 | 19/10 | | | | -------------------------------+--------+---------+ Area, square inches | ·1613 | 0·25 | Area, square millimetres | 104 | 161·25 | Weight per 100 yards run lb. | 392 | 576 | Cost of copper at 7¾_d._ |12 13 0| 18 15 0| Cost of insulation |24 17 0| 35 17 0| +--------+---------+ Total cost of Cables |37 10 0| 54 12 0| Casing, bitumen, and cement |12 10 0| 12 10 0| Labour, Laying | 5 0 0| 6 0 0| Trenching and repairing |25 0 0| 25 0 0| Surface boxes and connection |10 0 0| 10 0 0| Engineer and superintendent | 5 0 0| 6 0 0| +--------+---------+ Total |95 0 0|114 2 0| Add extra if copper, at | | | 9½_d._ | 2 17 0| 3 5 0| +--------+---------+ |97 17 0|117 7 0| Cost of copper per lb., | | | laid complete | 0 5 0| 0 4 1| Current in ampères | 58 | 90 | Cost per ampère | 1 13 9 | 1 6 0| -------------------------------+--------+---------+