<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31431727</termId><termName>stereoscopic photographs</termName><termType>PT</termType><termNote><![CDATA[ Refers to double pictures of the same scene that produce the effect of three dimensionality when viewed through a stereoscope. They were first envisioned in 1832 by the English physicist Charles Wheatstone, who described this as a uniquely photographic art form, since a draftsman could not draw two scenes in exact perspective from viewpoints separated only 2 1/2 inches, which is the normal distance between human eyes necessary for the three-dimensional effect. Wheatstone's mirror stereoscope was not practical for use with photographs, and the invention was not popular until the 1850s, when Sir David Brewster, a Scottish scientist, designed a simpler viewing instrument. The introduction of the collodion process, which simplified exposure and printing techniques, allowed three-dimensional photographs to become a popular craze. They may be daguerreotypes, negatives, or other forms of photographs. For images in the form of photographic prints on cards, use the more specific term "stereographs." ]]></termNote><termCreatedDate>2026-03-30 20:56:28</termCreatedDate><relation><relationType>UF</relationType><termId>31431728</termId><termName>photographs, stereoscopic</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431729</termId><termName>stereo pairs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431730</termId><termName>stereo photographs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431731</termId><termName>stereo views</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431732</termId><termName>stereograms</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431733</termId><termName>stereophotographs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431734</termId><termName>stereos</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431735</termId><termName>stereoscopic photograph</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431736</termId><termName>stereoview</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431737</termId><termName>stereoviews</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431738</termId><termName>sterescopic views</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31431739</termId><termName>views, stereo</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31402035</termId><termName>photographs by picture-taking technique</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31452836</termId><termName>stereographs</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31452842</termId><termName>anaglyphs</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31452844</termId><termName>parallax stereograms</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31452849</termId><termName>tissue stereographs</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31452854</termId><termName>half stereographs</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31461580</termId><termName>stereoscopic cameras</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31371293</termId><termName>stereoscopic photography</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31420514</termId><termName>stereoscopes</termName><termType>PT</termType></relation></term>  </Zthes>