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Thompson B A D Sc F R S
Sector Shutters By Cyril F LanDavis F R P S
On Transmission of Visible Light by Photographic Lenses
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achromatic adjusted alloys angle angular aperture aplanatic light aplanatic pencil apparatus appear astigmatism axis beam binocular brightness calculations camera candle-power centimetres centre circle collimator colour coma concave correction curvature curve diagram diameter Diff diffracted light diffraction pattern dispersion distance effect equal Error experiments eye-piece focal length focal plane focal point focus focused foot-candles formula Fresnel Geometrical Optics glass holophane illumination incident instrument J. W. Gordon lamp length of spectrum lens lenses magnification means measurements method mirror National Physical Laboratory object oblique Observatory observed obtained optical system ordinary parallel photographic photometer pinhole placed plate position practical principal planes prism Prof projection quartz radiate pattern radius refraction refractive index rotation Sand Casting scale seen shown shutter slide slit source of light spectacle spectra spectrographs spectrum XX spherical aberration surface telescope testing vertical visibility wave length white light