Micrometric shutter for studying minute fields of color. After Münsterberg. By Elbs, Freiburg
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See a color photograph of this device in the <link href='http://dssmhi1.fas.harvard.edu/emuseumdev/code/emuseum.asp?rawsearch=Number%2F%2C%2Fis%2F%2C%2FWJ0038%2F%2C%2F0%2F%2C%2F0'>Harvard Collection of Historical Scientific Instruments</link>.