The Essex Record Office has published a recording of a speech made by Guglielmo Marconi in 1935. You can listen to the recording by clicking here or listening via the embedded player below (description follows):

(Source:Essex Record Office via Southgate ARC)

“Second part of a speech made by Guglielmo Marconi on the occasion of the unveiling of the ‘Fisk Memorial’ at Wahroonga, Sydney, New South Wales, Australia on 14 December 1935 (the disc is incorrectly labelled). The ‘Fisk Memorial’ commemorates the first direct wireless message sent from the U.K. to Australia, in 1918.

In the speech, Marconi forecasts the impact that wireless communication will have on ship navigation, but also the world economy generally. Would he be surprised by how accurate he was in his prediction that ‘no country can make much headway’ without such technology?”