Bryn Mawr College monographs . nitialratios are reduced to i as a common standard. In Chart VI, percent, loss of efficiency as evaluated by this method is plottedagainst intrinsic brilliancy of reflector. As before; intrinsicbrilHancy of reflector is plotted along the abscissa, and per cent. II20 TRANSACTIONS OF ENGINE^ERING SOCIETY loss of efficiency along the ordinate. A comparison of these re-sults with the former will show the same order of rating of thereflectors but a slight change in the position in the scale given tosome of the reflectors. For the purpose of discovering w
Bryn Mawr College monographs . nitialratios are reduced to i as a common standard. In Chart VI, percent, loss of efficiency as evaluated by this method is plottedagainst intrinsic brilliancy of reflector. As before; intrinsicbrilHancy of reflector is plotted along the abscissa, and per cent. II20 TRANSACTIONS OF ENGINE^ERING SOCIETY loss of efficiency along the ordinate. A comparison of these re-sults with the former will show the same order of rating of thereflectors but a slight change in the position in the scale given tosome of the reflectors. For the purpose of discovering what is CHART the tendency of the six types of reflectors to cause loss ofvisual efficiency or power to sustain clear seeing. Ratio of time clear tototal time of observation is plotted against length of test period. Foot-candles Reflector Type I ..Type II ,Type IIIType IVType VType VI VoltsIIIIIO Horizontal Vertical 45° Z-1 the best way of treating the results of the tests, several methodhave been employed. Up to and including the present papejhowever, only three of them have been given in print: ratio ctime clear to time blurred, ratio of time clear to total time c FKRREE AND rand: EXPERIMENTS ON THE EYE II2I observation, and the per cent, of drop in the ratio time clear totime bkirred. An ultimate decision with regard to what is thebest method of treatment of the results can come, we believe, onlywith the consideration of a larger number of work was concluded by determining for the six types of CHART VI. Showing the tendency of the six types of reflectors to cause loss ofvisual efficiency or power to sustain clear seeing. Percentage drop in ratiotime clear to total time of observation is plotted against brightness ofreflector in candlepower per square inch. Foot-candles Reflector Volts Type I Ill TypeType
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Keywords: ., bookauthorbrynmawr, bookcentury1900, bookdecade1900, bookyear1901
