Background
Cracknell was born at Rochester, England, and educated at the University of Oxford.
Cracknell was born at Rochester, England, and educated at the University of Oxford.
He came to Adelaide as Assistant Superintendent of Telegraphs with Charles Todd in November 1855, and became Assistant Superintendent of Telegraphs, New South Wales, in January 1858, opening the first telegraph line to Liverpool on the 26th of that month. In 1861 he became Superintendent of Telegraphs. In 1876 he studied torpedo warfare, and was lieutenant-colonel commanding the North.S.W. Torpedo and Signalling Corps.