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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John Spencer began work with the CSIRO Division of Building Research in 1949 and used CSIRAC from 1959 until it was dismantled in 1964 for computations associated with the measurement of solar radiation and the calculation of radiation tables. Here he is shown in a later photograph at CSIRO (Highett, Melbourne) adjusting the shade ring on solar radiation measuring equipment in 1968.

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