Report of the Meetings Volume 4

Report of the Meetings Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1835 edition. Excerpt: ...himself, the intensity of the light will depend on the relation between the time of vibration of the optic nerve, and the interval of the impulses of the succeeding particles. If this interval be equal to the time of vibration, or to any multiple of it, the second impulse will add its effect to that of the first, and the motion be accumulated. It will, on the other hand, be destroyed, if the second impulse follows the first at an interval equal to half that time. It is here assumed that the emitted particles succeed one another at equal intervals, as will be the case if their emission be owing (as Newton supposed it to be) to a vibratory motion of the parts of the luminous body. But we must assume further that the intervals of emission vary with the nature of the particles, in the light of different colours; or that all the reclmaking particles (to use an expression of Newton) are emitted at one certain interval, all the blue-making at another; and so for each difi'erent species of simple light. Hence the vibrations of the parts of the luminous body must be of diiferent periods for the light of different colours. This is, in truth, a part, and a necessary part, of the theory of waves; but it has no connexion whatever with the principles of the rival theory. II. Reflexion and Refraction of Light. To account for the phenomena of reflexion and refraction it is supposed, in the Newtonian theory, that the particles of bodies and those of light exert a mutual action;---that, when they are nearly in contact, this action is attractive, ---that, at a. distance a little greater, the attractive force is changed into a repulsive one, --and that these attractive and repulsive forces succeed one another probably for many alternations. The absolute...show more

Product details

  • Paperback | 308 pages
  • 189 x 246 x 17mm | 553g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236782321
  • 9781236782328