Handbook of photomicrography / by H. Lloyd Hind and W. Brough Randles.

  • Hind, H. Lloyd (Herbert Lloyd)
Date:
[1913]
Catalogue details

Licence: In copyright

Credit: Handbook of photomicrography / by H. Lloyd Hind and W. Brough Randles. Source: Wellcome Collection.

    38/488
    PLATE 2. Photographs at Natural Size or small magnification with ordinary Photographic and Telephoto Lenses. A Embryo CiircK in Shkll after 19 days incubalion x 1 Objeclive ... .\l)eiiurc ... Plate Illinuinanl E.ri)0surc ... Devc]o})cr ... Idiotopraiihic lens. R.R. 6 Focus. ... F. 32. ... Imperial Special Rapid. ... Diffused daylight. ... 2 min. ... I'yro-soda. The chick was exposed hy carefully culling away Ihe upper part of the shell under water. The ])hotograph was taken with the ohject completely immersed in water; the shell supported on a hase of plasticine. The hlack background is a sheet of l)lack paper soaked in methylated spirit jirevious to immersion in wafer, to avoid air bubbles rising from the paper. Fossils x oh B Iloplites Unilus from the Gault, Cambridge, England. C Polamides crislatus from Ihe Lutetien, Chamhors, France. Objeclive ... .{perl a re ... Exiension J>lale. IlluininunI Exposure ... Developer I’he fossils were usi'd. ... Dallmeyer's “_\don” Telephoto, with exiension tube. ... Iris in extension tube closed down to its limil. ... Image distance, 19^. Separation of lenses, 5^. ... Schleussner’s “Paragon. ” Fine grain ordinary. ... 4 amj). arc, diffused. ... B. 2 min. Dark-coloured fossil. C. 1 min. White fossil. ... Metol-quinol. laid on dead hlack paper and a vertical camera The great restriction of aperture is necessary to get covering powel- and depth of focus, as the “ \don'’ was made for distant objects. Photos. W. B. R H. L. H. I To follow page 16.