Memoir Upon the Light-House Illumination of the Coasts of France; By Leonce Reynaud. Translated for the Light-House Board of the U. S. by ... Thornton A. Jenkins

Memoir Upon the Light-House Illumination of the Coasts of France; By Leonce Reynaud. Translated for the Light-House Board of the U. S. by ... Thornton A. Jenkins

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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. 1871 edition. Excerpt: ...by colza oil; and for the joints of the dioptric profile, a disposition has been adopted analogous to that which was referred to in speaking of the electric light. It is understood that the lens apparatus is susceptible of extremely varied forms, and it belongs to the engineers to adopt, in each particu lar case, those which appear the best adapted to the circumstances. Further 0n, numerous examples will be given. LUMINOUS INTENSITIES OF THE DIFFERENT PARTS OF THE APPARATUS. The intensities of the luminous beams emitted from the principal parts of the different orders of apparatus may be estimated, in prac tice, as indicated in the following table. The first gives the intensities in the axis, and the second the intensities on each side of the axis, for the dioptric annular lenses, the most generally used: Intensities of the luminous beams in the axis of the apparatus. Intensity.-2' L as, E o '' "" Indication of the apparatus. 9-33.2 5.-212. E ' 2.' 2: ' Q. is 5 5.? s 22 E? g =:32? " 3 2 _M"____fi_' ' 0 O 0 O Cylindrical lenses of fixed lights. t d Burners. Burners. Burners. Burners. ls or er.............................................................................. 23 130 440 60 2d order................................................................................ 15 70 240 25 3d order, large model............................................................ 5 2 18 05 7 3d order, small model............................................................ 3, 6 21.5 2. 5 4th order, (0.375m.).'................................................................ 1.6 2. 7 9.3 1 4th order, (0. 375m., ) for schiste oil........................................ 2. 2 4. 5 17.5 2 4th order, (0....show more

Product details

  • Paperback | 54 pages
  • 189 x 246 x 3mm | 113g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236776429
  • 9781236776426