Bryn Mawr College monographs . ;hart b > 5EM1 -IWIMCT. difference in the angle at which the light falls on the work pro-duces an effect on the eye that can be detected by the test w^have used for loss of efficiency. For the purpose of this pre-liminary investigation it was decided to make the general illumi-nation of the room such as to cause the eye little loss of effi- TRANSACTIONS OF II^IyUMINATING E:NGINBERING SOCIETY 484 ciency as the result of the period of work; and to add to thatat the point of work a component of Hght which was less diffusein order that the amount of light entering
Bryn Mawr College monographs . ;hart b > 5EM1 -IWIMCT. difference in the angle at which the light falls on the work pro-duces an effect on the eye that can be detected by the test w^have used for loss of efficiency. For the purpose of this pre-liminary investigation it was decided to make the general illumi-nation of the room such as to cause the eye little loss of effi- TRANSACTIONS OF II^IyUMINATING E:NGINBERING SOCIETY 484 ciency as the result of the period of work; and to add to thatat the point of work a component of Hght which was less diffusein order that the amount of light entering the eye would be moredependent upon the angle at which the reading page was held. The general illumination was obtained from the indirect systemused in the work of the preceding sections with lamps totalling800 watts. The less diffuse component at the point of workwas obtained from a 6o-watt lamp with a porcelain reflector ofthe desk lamp type. This lamp was turned into the horizontalposition and was placed behind the observer and to the left sothat th
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Keywords: ., bookauthorbrynmawr, bookcentury1900, bookdecade1900, bookyear1901
