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Jeffree cell
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<h2 id="external-links">External links</h2> <ul><li><a href="http://www.earlytelevision.org/yanczer_scoph.html">Scophony system at Early Television website</a> <a href="https://web.archive.org/web/20080517012320/http://www.earlytelevision.org/yanczer_scoph.html">Archived</a> 2008-05-17 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Jeffree cell light modulator, 1934". Retrieved 27 April 2019. <a href="http://collection.sciencemuseum.org.uk/objects/co8085650/jeffree-cell-light-modulator-1934-light-modulator" target="_blank">http://collection.sciencemuseum.org.uk/objects/co8085650/jeffree-cell-light-modulator-1934-light-modulator</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>