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Home > History and Archaeology > History > Elements of Physics, Or, Natural Philosophy, General and Medical (Volume 2); Explained Independently of Technical Mathematics, and Containing New Disquisitions and Practical Suggestions, in Two Volumes
Elements of Physics, Or, Natural Philosophy, General and Medical (Volume 2); Explained Independently of Technical Mathematics, and Containing New Disquisitions and Practical Suggestions, in Two Volumes

Elements of Physics, Or, Natural Philosophy, General and Medical (Volume 2); Explained Independently of Technical Mathematics, and Containing New Disquisitions and Practical Suggestions, in Two Volumes


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1831. Not illustrated. Excerpt: ... called the retina, is spread as a second lining. The eye is maintained in its globular condition by a watery liquid, which distends its cxtcrrral coverings, and which in the compartment before the lens, or the anterior chamber of the eye, being perfectly limpid, is called the aqueous humour, and in the remainder or larger posterior chambcr, being enclosed in a transparent spongy structure, so as to acquire somewhat of the appearance of melted glass, is called the vitreous humour. The annexed figure represents an eye of the common dimensions, supposed to be cut through the middle, from above down wards. C is the outer or sclerotic coat, known popularly, where most exposed in front, as the white of the eye. A is the transparent cornea joined to the edge of the round opening of the sclerotic: it is more bulging than the sclerotic, or forms a portion of a smaller sphere than the general eye-ball, so that while it may be truly called a bow window, it, or rather the convex surface of its contained water, is also a powerful lens for acting on the pencils of entering light. At B, and similarly all round the edge of the cornea, is attached the window curtain or iris, shown here edgeways, immersed in the aqueous humour, and hanging inwards from above and below towards its central opening or pupil, through which the rays of light are passing to the lens. The iris has in its structure two sets of fibres, the circular and the radiating, which cross and act in opposition to each other. When the circular fibres contract, the pupil is lessened, when the radiating contract, it is enlarged: and the changes happen according to the intensity of light and the state of sensibility of the retina, --as may at any time be proved by closing the eye-lids for a moment to make the pupil dila..


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Product Details
  • ISBN-13: 9781235306433
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1235306437
  • Publisher Date: 13 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr

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Elements of Physics, Or, Natural Philosophy, General and Medical (Volume 2); Explained Independently of Technical Mathematics, and Containing New Disquisitions and Practical Suggestions, in Two Volumes
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Elements of Physics, Or, Natural Philosophy, General and Medical (Volume 2); Explained Independently of Technical Mathematics, and Containing New Disquisitions and Practical Suggestions, in Two Volumes
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