A Technical Appraisal of the 70 Mm. Format for Map Reproduction: The Papers of a Symposium Held at the Hatfield College on the 10th January 1968 |
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0.60 Relative log 70mm film 70mm format 70mm microfilm Airy disc ANGLE PROCESS LENS Angstrom units APOCHROMATIC axis centre Chromatic aberration combinations constriction detail diffraction limit discussion DOUBLE GAUSS TYPE Eastman Kodak Eight Crown exposure f number Figure 14 film holder flatness G.W.W. Stevens inches J.H. Altman Kodak lens designer LENS SPECIAL DOUBLE Line spread plots line widths lines per millimetre lines/mm lithographic printing plates log E Figure magnification Major Fortescue manometer map reproduction map sheets microns miniature minimum modulation transfer function optical Optimised Ordnance Survey original paper photographic pneumatic gauging position possible printing on demand problem PROCESS LENS SPECIAL range reciprocal formula reduction factor Relative Aperture Relative intensity residuals resolving power result SAGITTAL SECTION Figure scale maps SECONDARY SPECTRUM SECTION SAGITTAL SECTION shows single colour slits SPECIAL DOUBLE GAUSS stipples suggested TANGENTIAL SECTION SAGITTAL theoretical tolerances variation Visual Light Correction W₂ wavelength WIDE ANGLE PROCESS