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<p>[QUOTE=&quot;terry5732, post: 324202, member: 42&quot;]LA set of five specially selected colored-glass filters to identify variables of malfunction</p><p>of photoelectric recording spectrophotometers equipped with tristimulus integrators have</p><p>been standardized on a number of spectrophotometers corrected for all known errors (wavelength,</p><p>zero, 100 percent, slit-width, inertia, back-reflectance, and stray-energy) J To these</p><p>standardized spectrophotometric data definite amounts of these errors were deliberately</p><p>introduced and converted to tristimulus values and chromaticity coordinates of the International</p><p>Commission of Illumination system of colorimetry for Sources A, B, and C. Similar</p><p>reductions show the effects of slit widths of 1, 5, 10, and 15 millimicrons (HIM) on computed</p><p>results both by the selected-ordinate method of 10, 30, and 100 ordinates, and by the</p><p>weighted-ordinate methods of 1-, 5-, 10-, and 15-mju intervals. Duplicate sets of these</p><p>glasses have been evaluated by visual comparison with this set of master standards, and are</p><p>available as part of the Standard Materials Program of the National Bureau of Standards.</p><p>By comparing the certified values of luminous transmittance and chromaticity coordinates</p><p>for a set of these glasses with the values obtained on a particular integrator-spectrophotometer</p><p>combination, the type and extent of instrumental errors may be evaluated.</p><p><br /></p><p>Materials. Two hundred 2 X 2-in. polished squares</p><p>of each of five types of glass, each group of 200</p><p>squares being from the same melt, were purchased</p><p>from Corning Glass Works. Our designations for</p><p>the five types of glass, the Corning designation, and</p><p>thickness are as follows:</p><p>2101, Selenium orange red, Corning 3480, 2.6 mm.</p><p>2102, Signal yellow, Corning 3307, 2.6 mm.</p><p>2103, Sextant green, Corning 4010, 4.4 mm.</p><p>2104, Cobalt blue, Corning 5551, 2.6 mm.</p><p>2105, Selective neutral, special glass developed by</p><p>Corning for this project, Corning 5045, 2.9 mm.</p><p><br /></p><p><a href="https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=13&amp;ved=0ahUKEwiEhpTmldvYAhVI0YMKHf3lAEgQFghYMAw&amp;url=http%3A%2F%2Fnvlpubs.nist.gov%2Fnistpubs%2Fjres%2F066%2F3%2FV66.N03.A01.pdf&amp;usg=AOvVaw3bQVRHagpKbPYwOfO9bQJx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=13&amp;ved=0ahUKEwiEhpTmldvYAhVI0YMKHf3lAEgQFghYMAw&amp;url=http%3A%2F%2Fnvlpubs.nist.gov%2Fnistpubs%2Fjres%2F066%2F3%2FV66.N03.A01.pdf&amp;usg=AOvVaw3bQVRHagpKbPYwOfO9bQJx" rel="nofollow">https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=13&amp;ved=0ahUKEwiEhpTmldvYAhVI0YMKHf3lAEgQFghYMAw&amp;url=http://nvlpubs.nist.gov/nistpubs/jres/066/3/V66.N03.A01.pdf&amp;usg=AOvVaw3bQVRHagpKbPYwOfO9bQJx</a>[/QUOTE]</p><p><br /></p>

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