Wohlgemuth, Adolf, b. 1868 · Cambridge, University Press · leaf 53
Oivn Observations 33 In Experiment 2 one of these slides was put before a demonstration lantern and the light of a 200 candle power arc lamp sent through. As the observer looked into the slide the contours were very distinct and definite, and the light was dazzling. Yet there was a marked after-… … Fig. 6. Rosette B. Fig. 5. Rosette A. In Experiment 3 two cylinders with alternating black and white stripes parallel to the axis of the cylinder, so that on rotation the stripes moved at right angles to their length, were placed side by side in the dark room. The light from a 50 candle power lamp…
