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<p>[QUOTE=&quot;QuincyAK10, post: 324217, member: 6159&quot;]&quot;In the February 1941 meeting of the optical Society of America, it was announced that <i><b>Corning</b></i> 5120 <i><b>didymium glass</b></i> filters were available from NBS for calibrating the wavelength scale of spectrophotometers &quot; Spectrophotometers use light absorbance to measure concentrations of solutions...50+ years of teaching science doesn&#039;t normally come in handy in the antique field <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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