A glass slide promoting Robert Menzies for election as prime minister with caption `Which leader for Australia?' and the name of his political opponent, Labor Party leader HV Evatt, crossed out.

In the early 20th century, political parties discovered a new way to reach a large captive audience of potential voters – the cinema.

Before the start of the advertised feature, political advertisements were projected on the screen using glass slides.

In the 1940s and 50s, slides like this one used strong colours to stand out and convey their message.

Menzies' campaign was successful and his Liberal-Country coalition won the December 1955 election.