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<p>Gives some applications of the curve of visibility of radiation for the average eye (125 observers) to radiation problems. A mathematical equation is given of the average visibility curve. Using this visibility equation and Planck's equation of the black body, calculations are made of the luminous flux emitted by such a body at various temperatures, also the luminous efficiency, the Crova wave-length, and the mechanical equivalent of light. The visibility curve of the average eye gives the value for the least mechanical equivalent of 1 lumen = 0.001627 watt of luminous flux of max. luminous efficiency (the least mechanical equivalent is the ratio of the candle or lumen to the watt for monochromatic radiation having the wave-length of max. visi
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<br>Subjects: rays and radiation</div>
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