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[[line]] with ring photometer rendered translucent with spirits of turpentine oil Toward candle 799 Towards lamp 13.65 ----- 2)21 64 ----- average 10.82 By equality of illumination mean of 10 sets 9.51 [[line]] with tracing paper Toward candle 5.15 Towards Lamp 23.90 ----- 2)29 05 ----- mean of --- 14 50 2 exp each way [[strikethrough]] This [[/strikethrough]] [[end page]] [[start page]] [[in pencil]] 37 with equal illumination two sets mean 10.00 From these results is apparent that the mean with this or more translucent paper is not the safest since the extremes are so far apart.