Nature Volume 89

Nature Volume 89

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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. 1912 edition. Excerpt: ...by very simple means. The new feature of the mechanism, which results in somewhat remarkable properties, is the employment of what is called "a floating guide ring." This device largely reduces the friction of the contrivance when working under high pressures.--Prof. R. A. Sampson: A new treatment of optical aberration. A method is developed by which Gauss's method of relating original and emergent rays in a coaxial optical system y = Px + b, y' = $'x' + b', z = yx + c, J o' = y'x' + c', j by means of a transformation, b' = Gb + H/8, 0'=Kb + L/3, c' = Gc + Hy, y' = Kc + Ly, where GL-HK=/i//i'=N, may be applied so as to include the aberrations of the third order. The method is adequate for the numerical calculation of telescopic objectives, and offers a remarkable economy in the work hitherto necessary.--Sir W. de W. Abney: The extinction of light by an illuminated retina. In this communication the author describes an apparatus adapted for illuminating the retina with known amounts of light, coloured or white, and for extinguishing the sensation of the light in the different colours of the spectrum. Confining himself to the stimulation of the retina by white light only, he shows the movement in the spectrum of the rays requiring the maximum amount of diminution to extinguish their light according as the retina is more or less illuminated.--Dr. W. Wahl: Optical determinations at high pressures. Diagram of state of carbon tetrabromide.--The melting point of CBr, is raised i by a pressure of 16 kg. cm.2 The transition point from monoclinic to regular crystal form is raised i by 32 kg. cm.3 The melting-point curve and the transition-point curve do not, therefore, intersect at high pressures to form a "triple point." In...show more

Product details

  • Paperback | 768 pages
  • 189 x 246 x 39mm | 1,347g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236882873
  • 9781236882875