demanded stronger powers for the Year P (volts per Station Period Latitude metre) Eskdalemuir 55° N 1912-22 256 Potsdam 52° N 1904-23 203 Kew 51° N 1913-23 333 Davos 47° N 1909-10 64 Tortosa 41° N 1911-23 108 Samoa... 14°S 1913-8 115 Cape Evans 1-68 2:07 2-0I I-31 0-98 1-57 0-82 260