Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 336
r cap the lens; and this samearrangement must be followed in photographingfireworks. It would be well to have several plates handyand after each burst of rockets the lens could beclosed, and a new plate inserted, and in this waya record obtained of a whole evenings display. 19] NATURE AND SCIENCE… … lhotograph by Underwood & Underwood. A BAROGRAPH FOR MEASURING THE HEIGHTOF AN AEROPLANE. ter, which all balloonists carry suspended fromsome part of the frame. Clockwork sets a cylin-drical card in motion, and on it a small pentraces certain marks that are easily understoodby the aviator. The…
Children's literature
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