He retired from parliament at the double dissolution of 11 November 1975.

Six double dissolutions have occurred, though a joint sitting was only held once, in 1974.

This has occurred on only one occasion, after the election following the 1974 double dissolution.

On 18 May 1974 a double dissolution of both Houses was held.

Following a double dissolution half the state senators serve only three-year terms.

A double dissolution is the only circumstance in which the entire Senate can be dissolved.

There have been 6 double dissolutions: in 1914, 1951, 1974, 1975, 1983, and 1987.

The government had accumulated a total of 21 trigger bills, but did not call for a double dissolution.

A double dissolution, which would have involved the entire parliament being elected, is no longer possible.

She retired from politics at the double dissolution of 5 June 1987.