Australian Constitution - Section 7 - The Senate

The Senate shall be composed of senators for each State, directly chosen by the people of the State, voting, until the Parliament otherwise provides, as one electorate.

But until the Parliament of the Commonwealth otherwise provides, the Parliament of the State of Queensland, if that State be an Original State, may make laws dividing the State into divisions and determining the number of senators to be chosen for each division, and in the absence of such provision the State shall be one electorate.

Until the Parliament otherwise provides there shall be six senators for each Original State. The Parliament may make laws increasing or diminishing the number of senators for each State, but so that equal representation of the several Original States shall be maintained and that no Original State shall have less than six senators. {** Note: number of senators for each State increased to 10 by the Representation Act 1948-49, S.4 **}

The senators shall be chosen for a term of six years, and the names of the senators chosen for each State shall be certified by the Government to the Governor-General.