Newton's disk, 80 ctm. in diameter. By Queen, Philadelphia See the same disk on <link ref="tec2948">another photograph</link> from the same set. See another figure of this disk in <link href="http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/52503/imagepages/image117.htm">a Queen catalog from 1874</link> (no. 6190). In 1884, <link href="http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/52536/imagepages/image235.htm">another Queen catalog</link> references Newtons color disk (no. 639), but does not describe it. Newton's disk, 80 ctm. in diameter. By Queen, Philadelphia
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Source
Anonymous.
1892.
Harvard Psychological Laboratory in Dane Hall: Interior of a Laboratory Room.
(p. p0002, fig. M75).
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