2022 $1 ANDA Sydney 150 Years Overland Telegraph PNC

On 22 August 1872, the Overland Telegraph line between Adelaide and Darwin was finally connected. The telegraph involved 36,000 poles across 2,839 kilometres, from Port Augusta in the south to Darwin in the north, through territory virtually unexplored by Europeans. Charles Todd, South Australia’s Superintendent of Telegraphs and the Postmaster-General, was the visionary responsible for bringing the project to realisation. This huge logistical achievement has been called the greatest engineering feat of 19th century Australia.