Hawley C. White (1848-1925), a photographer in Bennington, Vt., patented a stereoscope viewer in 1895, and termed it a Perfecscope. The H. C. White Co. manufactured stereoscopes of this sort, and applied for a trademark on the term in 1899. This example is made of aluminum. An inscription reads, in part, “THE PERFECSCOPE / TRADE MARK / . . .” It was probably used for experiments in experimental psychology.
Ref: Hawley C. White, “Stereoscope,” U.S. Patent 548,148 (Oct. 15, 1895).
Edward Titchener, Experimental Psychology (New York, 1901), pp. 137-144.
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