Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 848
at the performance20,000 times each second, and so M. Bull getsaround the difficulty by keeping the camera opeitin the dark and making the exposures hy the liglil of a stream of sparks which cast silhouettes of thebullet on the film. The sparks can be regulatedto discharge at a rate as high as…
Children's literature
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![An illustration from St. Nicholas [serial], 1873, leaf 848](https://img.insideoutlibrary.com/img/1024/ia-stnicholasserial4721dodg-848-1006.webp)
