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Title: Johnson's actinometer (autotype), (single-tint print meter), [Go to resource]
Description: Johnson's actinometer (autotype), (single-tint print meter), 1910-1920. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: actinometer
exposure meterSource: Science Museum Creator: Johnson (maker) Identifier: 1929-277 Go to resource More Like this...
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