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Identity of Light and Nerve Force

Identity of Light and Nerve Force


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879. Excerpt: ... knowledge of qualities of objects to each of the other senses. What Is Light? The question is frequently asked, what is light? And many attempts have been made to answer it. By some, light is called an attenuated substance; by others it is called an attenuated motion. The difficulties connected with either view are appalling; and it is doubtful if either the emission theory of an attenuated substance, or the undulatory theory of an attenuated motion gives us any deeper or clearer insight into the nature of light than is obtained by simple observation. Our eyes, by the emission theory, are pelted by the attenuated atoms of matter discharged by combustion and impinging on our optic nerves with a velocity of one hundred and eighty thousand miles a second. The battering force of these impinging atoms has been variously estimated and calculated by mathematicians, and by these estimates the impinging force of the atoms would far exceed the force imparted to matter by gunpowder. The most attenuated matter known is hydrogen, and if this substance was driven with the velocity of light against our bodies, they would melt, vaporize and vanish in thin air in a very few minutes. We cast our eyes around us in every direction, and light from millions of objects reach our vision, depicting their forms and colors on the retina. The light for these images may pass through glass, water or other transparent substance; it may be sifted, or it may be absorbed for days or years, and yet no substance that can be called light has ever yet been caught for examination. Then again substance may be burned in a glass vessel emitting an intense light in every direction, and the carbonic acid or other material products of combustion examined, and the original amount of carbon and oxygen...


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Product Details
  • ISBN-13: 9781235736230
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 44
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235736237
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr

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