Experimental form 1 (Licence to use Wireless Telegraph for Experimental purposes) dated 14 November 1905 and made out to Ernest Dundas Gledall Esq BSc, issued by the General Post Office on behalf of the Postmaster General, British, 1905.

The Wireless Telegraphy Act of 1904 required anyone wishing to use wireless telegraphy for experimental purposes to apply for a licence from the General Post Office (GPO). Applicants had to provide evidence of British nationality, as well as two character references. The earliest experimenters sent and received Morse code by radio, followed later by experimenters transmitting and receiving voice transmissions.