---------------------------+---------+---------+------------- Area in square inches | 2·0 | 2·55 | 3·00 Area in square millimetres | 1290 | 1645 | 1935 Weight of copper in lb. | | | per 100 yards | 4612 | 6125 | 6918 Cost of copper at | | | 7¾_d._ per lb. |149 0 0|190 0 0|224 0 0 Laying | 9 15 0| 9 15 0| 10 0 0 Insulators | 0 4 6| 0 4 6| 0 4 6 6 surface boxes and | | | connections | 10 0 0| 10 0 0| 10 0 0 Culvert, 18 inches × | | | 12 inches, for | | | two lines conductor, | | | in brickwork | 53 8 0| 53 8 0| 53 8 0 and cement, | | | replacing pavement | | | Engineers and | | | superintendence | 10 0 0| 10 0 0| 15 0 0 +---------+---------+------------- Total |232 7 6|263 7 6|312 12 6 Extra for copper at | | | 9½_d._ per lb. | 34 0 0| 43 10 0| 51 0 0 +---------+---------+------------- Total |266 7 6|306 7 6|363 12 6 Cost of copper per lb. | | | laid complete | 13·8_d._| 12_d._ | 12 6_d._ Current in ampères | 720 | 910 | 1080 Cost per ampère | 0 7 5| 0 6 9| 0 6 8½ ---------------------------+---------+---------+------------- THE VIENNA CENTRAL-STATION.