One of South Australia's earliest buildings and home to over 300 000 people from 1841 to 1988, Adelaide Gaol is one of Australia's longest operating prisons.
Alexander Tolmer was a Police Commissioner, initiator of the gold escorts, and by all accounts a colourful character with a thirst for action and adventure.
This compass is believed to have been used by John William Billiatt on the successful 1861-1862 expedition with John McDouall Stuart across Australia, from Adelaide to Chambers Bay, east of the present site of Darwin.