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}}</ref> However, he was soon obliged to drop his investigations of telegraphy for personal reasons. His patent was purchased by the [[Electric Telegraph Company]] in 1847 for £600,<ref name=bsp/> mostly in order to obtain the rights to to the electric relay invented by Davy. The rest of his telegraph system was not wanted, other than to prevent competitors from using it. Davy's relay used a magnetic needle which dipped into a mercury contact when an electric current passed through the surrounding coil. In recognition of this he was elected in 1885 as an honorary member of the [[Society of Telegraph Engineers]] and was informed of this by telegraph shortly before his death.<ref name=adb/>
Davy apparently had some thoughts on a wireless telegraphy system. This system was an electrical-acoustic hybrid, but Davy's writings are far from clear exactly what was intended and nothing was put into practice. According to
Davy's marriage broke down shortly after the Regent's Park demonstration and he gave up work on telegraphy as a result. In 1838 Davy migrated to South Australia without his first wife and son.<ref name=Platinum>Donald McDonald, Leslie B. Hunt, ''A History of Platinum and its Allied Metals'', pp. 306-307, Johnson Matthey Plc, 1982 ISBN 0905118839.</ref> He was editor of the ''Adelaide Examiner'' from June to July 1842 and was elected president of the Port Adelaide Mechanics' Institute at its inaugural meeting in 1851.<ref name=adb/> Davy was a director and manager of the Adelaide Smelting Company and became chief assayer of the Government Assay Office in Adelaide in February 1852.<ref name=adb/>
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