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Title: Ferguson wedge density meter for photographic plates, 1911, [Go to resource]
Description: Ferguson wedge density meter for photographic plates, 1911, in wooden box. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1911 Source: Science Museum Creator: Ferguson (maker) Identifier: 1938-117 Go to resource More Like this...
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