Duke of Gloucester Speaks to Dominions Over Radio Telephone --The Duke of Gloucester making his speech to the British empire dominions over the radio telephone. The Duke of Gloucester speaks to dominions over radio telephone -- London, April 14 - The Duke of Gloucester spoke by radio-telephone to Canada, Australia, New Zealand and South Africa and India when he performed the opening ceremony of the extension to the world headquarters of the overseas league here today. The post office made elaborate arrangements in co-operation with the authorities in different parts of the empire, to enable the Duke of give a message from the King. May 3, 1937. (Photo by Associated Press Photo).