Cockatoo Island became a gaol in 1839, following advice from
NSW Governor George Gipps to the
British Secretary of State for the Colonies that convicts would be sent to the island after the closure of the
Norfolk Island convict establishment. The convict precinct was built over a number of years. Quarrying of silos was one of the early convict tasks. To service
Royal Navy ships, Fitzroy Dock was completed in 1857 (see below). Cockatoo became the major government dockyard in Australia. In 1869, prisoners were transferred from the island to
Darlinghurst, and the prison buildings became an industrial school for girls and a reformatory in 1871. The dockyard area was now separated from the institutional area on the top of the island by a fence. Following the departure of the females in 1888, prisoners were again sent to the island, and the gaol function continued until about 1909. Meanwhile, the dockyard function expanded, and the
Sutherland Dock was built in 1890. The
NSW Public Works Department declared Cockatoo Island the state dockyard. Following the
Federation, in 1913, the
Australian Government declared Cockatoo Island to be the Commonwealth Dockyard, and the island, both through shipbuilding and servicing, played an important role both in the development of the
Royal Australian Navy and during
World War I. The former prison buildings were now used as offices. In 1933, the dockyard was leased from the Australian Government by Cockatoo Docks and Engineering Co Ltd and the island played a very significant role during
World War II. After the war, the dockyard (now known as Vickers) continued, and submarine facilities were introduced. The dockyard closed in 1992, and some demolition took place. A sale of the island was proposed. The island is now vested in the
Sydney Harbour Federation Trust. Fitzroy Dock was constructed to enable the servicing of Royal Navy ships in eastern Australian waters. Cockatoo Island was selected as the site due to the availability of good stone for building, and the presence of a convict labour force on site. NSW Governor Gipps put the proposal in 1846, the
New South Wales Legislative Council approved the project, and construction commenced in 1851. It was the first large
graving or dry dock commenced in the southern hemisphere. However,
Mort's Dock at
Balmain, though begun later, was completed sooner. It was a commercial dock built by a free labour force and took one year to construct, whereas Fitzroy was entirely built by convicts and took six years. When completed in 1857, Fitzroy Dock was the largest dry dock in the Southern Hemisphere and one of the largest in the world at that time. It was the biggest engineering project completed in Australia to that time, and today (given that Mort's Dock closed many years ago) it is the oldest surviving dry dock in the nation. The dock was designed and built under the direction of Captain
Gother Kerr Mann. Mann was appointed Engineer-in-Chief on Cockatoo Island and he subsequently became Superintendent of Convicts as well. The dock was named after NSW Governor Sir
Charles Augustus FitzRoy who laid the inverted keystone in 1853. The steam-powered pumping machinery was purchased from the company of
George and Sir
John Rennie of London and was brought out by Henry Broderick, who became the first dock master and chief engineer at the dock. Construction of the dock required the blasting of a large section of cliff, supervised by Mann, which saw the first use of electrical firing of gunpowder in Australia. Work done on ships in the dock (by convicts initially) included shoring up, scraping, cleaning and painting of vessels. Until Sutherland Dock opened on Cockatoo in 1890, all servicing of Royal Navy vessels was conducted at Fitzroy. Sutherland Dock had been necessitated by the increasing length of ships as the 1800s proceeded, but Fitzroy was itself twice lengthened (by free labour) from the original c.96 metres to the present c.145 metres. Once Sutherland was opened, the original pumping arrangement for Fitzroy was superseded by the new Sutherland pump house at the western end of the island. During the twentieth century, Fitzroy catered still to smaller allied naval ships and the smaller ships (e.g. destroyers etc.) of the Royal Australian Navy. The dock thus played an important role during the First and Second World Wars. == Description ==