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Title: Watkins Bee meter [Go to resource]
Description: Watkins bee tint meter (actinometer) made in the shape of the pocket watch. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: actinometer Source: Science Museum Identifier: 1979-559/2023 Go to resource More Like this...-
Johnson's actinometer (autotype), (single-tint…Johnson's actinometer (autotype), (single-tint print…
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