This is one of a series of photographic material in print, negative and/or digital formats covering CSIRAC machine and the people associated with it. The series was acquired from the University of Melbourne in 2003.

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Ron Bowles adjusting Main Clock frequency; Herald-Sun photo 15 June 1956. TThe frequency of the oscillator could be manually adjusted to the centre of a set range by the maintenance engineers by adjusting the main oscillator control whilst observing the timing relationships on an oscilloscope.

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