Show sea collisions collision minimized the danger of collisions at sea on foggy nights can now be minimized by a new invention which shows with luminous spots and arrows on a compass marked screen the loca tion and direction of every ship within a radius of ten miles it Is a cathode ray device which la Is operated by the radio signals sent out by other ships every twenty seconds pilots watching it know practically by a mere glance at the chart when and how much to change their courses colliers weekly |