Elements of experimental and natural philosophy : being a familiar and easy introduction to the study of the physical sciences; embracing animal mechanics, pneumatics, hydrostatics, hydraulics, acoustics, optics, caloric, electricity, voltaism, and magnetism / by Jabez Hogg.

  • Hogg, Jabez, 1817-1899.
Date:
1861
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Licence: Public Domain Mark

Credit: Elements of experimental and natural philosophy : being a familiar and easy introduction to the study of the physical sciences; embracing animal mechanics, pneumatics, hydrostatics, hydraulics, acoustics, optics, caloric, electricity, voltaism, and magnetism / by Jabez Hogg. Source: Wellcome Collection.

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    had a circular disc divided into three compartments, on which he painted the three primitive colours, red, bhie, and yellow. This he caused to revolve with great velocity, until the three colours appeared nearly white. He next darkened the room, and threw the light of an electric spark on the disc, when the spectators saw the colours as if the disc were at perfect rest. Subsequently Mr.Pox Talbot produced an extremely sensitive prepared piece of photographic paper, and in June 1851, at the Eoyal Institution, placed it in a camera directed to a printed paper fixed on a wheel. The wheel was turned by a handle until the greatest velocity was attained that coiild be given to it. The camera was then opened, and a powerful electric battery was discharged in front of the wheel, illuminating it with a sudden flash of brilliant light. The paper was then taken out of the camera, and after applying the developing solution, a distinct image of the printed words was found beautifully im- pressed on the paper. Thus, then, the last convulsive strain of a Flying Childers at a winning-post may be caught as it truly existed; or an express train, moving at a rate beyond muscular powers in an animal, or more speedy than the vdngs of the wind, may be transferred to a photographic plate as if it were at rest; for the utmost speed that can be given by man is but rest in comparison to the flight of electricity. What, after this, is the most brilliant conception of the human mind in the region of imagination ? True demonstrable poetry exists in the world of science.