Sir Charles Todd was a leader in the fields of meteorology, astronomy and communications, and is best remembered for masterminding the construction of the Overland Telegraph Line.
Best known as a governor of South Australia, Sir Mark Oliphant was also a pioneering nuclear physicist, who became an outspoken anti-nuclear campaigner.
The bronze bust of Sir Mellis Napier, sculpted by eminent South Australian artist John Dowie, commemorates his distinguished community service, including to the law and legal profession in South Australia