Question: Boyle Travers Finniss, John Baker (for only 12 days) and Sir Robert Torrens were the first three Premiers of which Antipodean colony?

Context articles: Torrens Building
Henry Torrens (British Army officer)
Torrens Ministry
Baker Ministry
Finniss River
William Scott-Elliot
John Baker (Australian politician)
Robert Torrens
Robert Torrens (economist)
B. T. Finniss

The Torrens Building, named after Sir Robert Richard Torrens, is a State Heritage listed building on the corner of Victoria Square and Wakefield Street in Adelaide, South Australia.
 Originally known as the Government Offices, the Torrens Building has been home to a number of government departments for most of its existence.
 Since 2005, it been the site of the University City Adelaide precinct, housing campuses of Carnegie Mellon University, Cranfield University, University College London and Torrens University.
Torrens was born in Derry, Ireland in 1779.
 He was the youngest son of the Reverend Thomas Torrens and his wife Elizabeth Curry.
 He lost both his parents at an early age, and was educated at a military academy in Dublin.
 Robert Torrens, judge of the Court of Common Pleas (Ireland), was his brother and Robert's namesake Colonel Robert Torrens, the economist, was his first cousin.
 The family was of Swedish origin.
The Torrens Ministry was the 3rd Ministry of the Government of South Australia, led by Robert Torrens.
 It commenced on 1 September 1857 following the defeat of the Baker Ministry in the House of Assembly, and was succeeded by the Hanson Ministry on 30 September when they were themselves defeated in the House.
 At 29 days in office, it was one of the shortest ministries in the history of South Australia.
The Baker Ministry was the 2nd Ministry of the Government of South Australia, led by Premier John Baker.
 It commenced on 21 August 1857 after Baker's allies defeated the Finniss Ministry in the House of Assembly.
 The ministry lost a confidence vote after only two days, announced that they would resign, and adjourned parliament until the formation of the Torrens Ministry on 1 September 1857.
 At 11 days in office, it is the third-shortest ministry in South Australian history.
Finniss River is the name of two rivers in Australia, both named after colonial surveyor Boyle Travers Finniss.
William Scott-Elliot (sometimes incorrectly spelled Scott-Elliott) (1849-1919) was a theosophist who elaborated Helena Blavatsky's concept of root races in several publications, most notably "The Story of Atlantis" (1896) and "The Lost Lemuria" (1904), later combined in 1925 into a single volume called "The Story of Atlantis and the Lost Lemuria".
 In 1893 he married Matilda (Maude) Louise Travers (1859-1929), daughter of Dr Robert Boyle Travers F.R.C.S., of Farsid Lodge, Rostellan, County Cork, Ireland.
John Baker (28 December 1813 – 19 May 1872) was an early South Australian pastoralist and politician.
 He was the second Premier of South Australia, succeeding Boyle Travers Finniss; however, he only held office for 12 days from 21 August to 1 September 1857 before being succeeded by the third Premier of the colony, Robert Torrens.
Sir Robert Richard Torrens, {'1': ", '2': ", '3': ", '4': "} (1 July 1814 – 31 August 1884) was the third Premier of South Australia and a pioneer and author of a simplified system of transferring land.
Colonel Robert Torrens {'1': ", '2': ", '3': ", '4': "} (1780 in Hervey Hill, Derry – 27 May 1864 in London) was a Royal Marines officer, political economist, MP, owner of the influential "Globe" newspaper and prolific writer.
 Born in Derry, Ireland, he was the son of Robert Torrens of Hervey Hill.
 The Torrens family, thought to be descended from a Swedish officer in the service of William III of England, were a large and prominent Derry family.
 Among his numerous cousins were Sir Henry Torrens, the distinguished military adviser, and another Robert Torrens, a judge of the Court of Common Pleas (Ireland).
Boyle Travers Finniss (18 August 1807 – 24 December 1893) was the first Premier of South Australia, serving from 24 October 1856 to 20 August 1857.