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LOYD A JONES
4 The international unit of photographic intensity
6 other sections not shown
Aminophenol aperture approximately brightness bromide candle power characteristic curve color temperature computed constant contact printing D-log E curve density values desired diffuse density disk effective energy exposed exposure plane exposure value expressed film filter factors gradient Hurter and Driffield illumination illustrated in Fig inertia instrument integrating sphere intermittent light source log E axis log exposure logarithmic luminous intensity method monochromatic motion picture negative materials non-intermittent obtained opal glass optical panchromatic material Phot photographic density photographic material photographic sensitometry photometer photometric field plotted position practical precision pyrogallol radiant flux ratio region relatively rotating sector satisfactory scale sector wheel selective absorption sensitometric strip shown in Fig silver deposit spectral composition spectral sensitivity spectral sensitivity curve spectrograms speed values standard candle standard lamp straight line portion surface tablet transmission transmitted flux tricolor tungsten value of density various visual wavelength wedge Wollaston prism