ABSTRACT
About two years ago the author heard for the first time of a photographic achievement which seemed to him at the time scarce credible, and which he was presently assured by one of the ablest English photographers was absolutely outside the bounds of possibility,—to wit, the photographic presentation of a galloping horse. To photograph a galloping horse, however, with distinctness, requires on the one hand an exposure of much less than a second, or even than the tenth or hundredth part of a second. While, on the other hand, the luminosity of the image cannot, under any circumstances, be greater than that which, when ordinary photographs are taken, involves an exposure of several seconds at least. To get a picture which should show the limbs of a galloping horse with anything like distinctness, the blurring should not exceed a width corresponding to one inch in the life-size image of a horse.
