Australian banknotes 20 Australian dollars banknote 1991 Kingsford Smith & Lawrence Hargrave

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20 Australian dollars
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 20 Australian dollars note 
Australian banknotes 20 Australian dollars banknote of 1991, issued by the Reserve Bank of Australia.
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Obverse: Portrait of Charles Kingsford Smith along with five Lissajous curves drawn by a two-pendulum harmonograph.
Reverse: Portrait of Lawrence Hargrave with his drawings of kites and type aircraft designs.

Watermark: Portrait of Captain James Cook in the white field.

The Australian twenty dollar banknote was issued when the currency was changed from the Australian pound to the Australian dollar on 14 February 1966. It replaced the £10 note which had the same orange colouration. 20 Australian dollars paper banknote had a gradient of yellow and red, with a distinct orange colouration background. It is because of this vivid colour that the current note is often called a "lobster".

Sir Charles Edward Kingsford Smith MC, AFC (9 February 1897 – 8 November 1935), often called by his nickname Smithy, was an early Australian aviator. In 1928, he earned global fame when he made the first trans-Pacific flight from the United States to Australia. He also made the first non-stop crossing of the Australian mainland, the first flights between Australia and New Zealand, and the first eastward Pacific crossing from Australia to the United States. He also made a flight from Australia to London, setting a new record of 10.5 days.

Lawrence Hargrave (29 January 1850 – 14 July 1915), engineer, explorer, astronomer, inventor and aeronautical pioneer.