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Automatic lamp changer
open-in-new
<h2 id="history">History</h2> <p>The automatic lampchanger was invented by Charles Wallace and patented in 1928.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> This original model held two headlight lamps from a <a href="/facts/Model_T/wNywoygq">Model T</a> automobile. The <a href="/facts/United_States_Lighthouse_Service/pQkH5LQH">United States Lighthouse Service</a> had these in common use by the 1930s, as they moved to convert all navigational lights to electricity. </p> <h2 id="types-in-current-use">Types in current use</h2> <p>Lamp changers in current use may have two, four, or six lamps and use either a spring-loaded mechanism or an electric motor to change lamps when required. They are used in <a href="/facts/Aerodrome_beacon/6qL0Lprg">aerodrome beacons</a> and marine navigational aids.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a><a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"APL1297A Lampchanger" (PDF). Pharos Marine Automatic Power. Archived from the original (PDF) on 16 March 2012. Retrieved 16 September 2013. <a href="https://web.archive.org/web/20120316165816/http://www.automaticpower.com/products/catalog/APL-1297A.pdf" target="_blank">https://web.archive.org/web/20120316165816/http://www.automaticpower.com/products/catalog/APL-1297A.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Seeing The Light - The DCB-224 Aerobeacon". Terrypepper.com. Retrieved 2012-07-06. <a href="http://www.terrypepper.com/lights/closeups/illumination/aerobeacon/dcb224.htm" target="_blank">http://www.terrypepper.com/lights/closeups/illumination/aerobeacon/dcb224.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Aids To Navigation | The Carlisle & Finch Co". Carlislefinch.com. Archived from the original on 2009-03-09. Retrieved 2012-07-06. <a href="https://web.archive.org/web/20090309202653/http://carlislefinch.com/marine/aidsnav.htm" target="_blank">https://web.archive.org/web/20090309202653/http://carlislefinch.com/marine/aidsnav.htm</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Commandant Notice 16500" (PDF). United States Coast Guard. Retrieved 16 September 2013. <a href="http://www.uscg.mil/directives/cim/16000-16999/CIM_16500_17.pdf" target="_blank">http://www.uscg.mil/directives/cim/16000-16999/CIM_16500_17.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Office of Civil Engineering United States Coast Guard (January 2001). "Specification for 12VDC, Six-place Lampchanger for Maritime Aids to Navigation, Type CG-6P" (PDF). Washington, D.C. Retrieved 16 September 2013. <a href="http://www.uscg.mil/hq/cg4/cg432/docs/specifications/195-H.pdf" target="_blank">http://www.uscg.mil/hq/cg4/cg432/docs/specifications/195-H.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Lampchanger E390". Ekta.ee. 2011-03-01. Retrieved 2012-07-06. <a href="http://www.ekta.ee/html/e390.htm" target="_blank">http://www.ekta.ee/html/e390.htm</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Lampchanger PA2 Series & Diffuser" (PDF). Pelangi. Archived from the original (PDF) on 5 January 2009. Retrieved 16 September 2013. <a href="https://web.archive.org/web/20090105211848/http://www.pelangi.co.uk/pdf/s03/Pa2-diffuser.pdf" target="_blank">https://web.archive.org/web/20090105211848/http://www.pelangi.co.uk/pdf/s03/Pa2-diffuser.pdf</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> </ol>