Double sided (A-K, L-Z) design depicting radio masts, enabling the user to establish the distance from London of each of 76 stations, its wavelength, its interval signal, kilowatt power, time when noon in London, call sign and closing-down sign. Relates to British patent no.347,324 of F.X. Esterl of Augsburg, Germany for 'Improvements in or relating to Hand Operated Indicators for Displaying Variable Information'.