Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 70
ptible period of time. Its apparentmomentary duration is an optical illusion,—the impres-sion made on the retina of the eye remaining for a mo-ment after its cause has ceased; the flash revealing thewheel to the eye, and instantly ceasing, like the snap-shot of a kodak, but infinitely quicker.… … Fig. 13.
Electricity
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