2015-05-202015-05-20circa 1920http://hdl.handle.net/1885/135328.5cm x 8.5cmmounted transparencyb&wen-AUThis image is provided for research purposes only and must not be reproduced without the prior permission of the Archives Program, Australian National UniversityCommonwealth Solar Observatory (1924-1957)The Australian National University (1946 - )