Historic Engineering Marker - Overland TelegraphPrint Page Print this page


Photographs supplied by Stephen Warren

An Historic Engineering Marker commemorates the Overland Telegraph Line which was constructed from Adelaide to Darwin between 1870 and 1872.  

The Institution of Engineers Australia, through its Heritage Committees, established the Australian Historic Engineering Plaquing Program to acknowledge past engineering achievements and to draw public attention to the significant contributions they have made to society.The Plaquing Program is a means of bringing public recognition to significant historic engineering works and the engineers who created them. The Program is intended to contribute to the conservation of Australian engineering heritage.




Address:Franklin & King William Streets, Old General Post Office, Adelaide, 5000
GPS Coordinates:Lat: -34.926515
Long: 138.59957
Note: GPS Coordinates are approximate.
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Monument Type:Plaque
Monument Theme:Technology


Actual Monument Dedication Date:Friday 22nd October, 1999
Front Inscription

Historic Engineering Marker

The Overland Telegraph

Adelaide to Darwin, 1872

The 3,178 kilometre line was built in less that two years and joined on 22 August 1872. It linked Australia to an undersea cable from Indonesia that came ashore at Port Darwin and made communication between Australia and the rest of the world possible in hours rather than weeks.  The project was under the direction of Sir Charles Todd, KCMG, MA, FRS, FRAS, FRMS, FSTE, Superintendent of Posts and Telegraphs. The first telegraph messages from overseas were received in morse code in this building on 22 October 1872 via the Overland Telegraph Line. 

Dedicated by

The Institution of Engineers, Australia, 1999
Australia Post SA / NT

Source: MA
Monument details supplied by Monument Australia - www.monumentaustralia.org.au