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Introduction to microforms
B J S Williams National Reprographic Centre for documentation l
Microfilm production and quality control
35mm roll advantage aperture cards Bernard Williams bibliographic units Brampton capacity media catered Centre for documentation coding contact printing copy microfiches Costs per copy diazo dissemination duplication factors fiches flat formats frame full size print Graph half-tone handling Hatfield College indexing information density journals Kalvar l20 lines l6mm roll Learned Societies legibility lines per millimetre material micro micro-duplication micro-opaques microcards microfilm microform publishing microform service house microrecording Ministry of Technology mylar needs Newspapers operation original micro-publication Original microform publication paper copies Patent Office PCMl microfiche planetary camera possible present problems publishing system punched card reader reading recorded reports retrospective micro-publishing retrospective publication roll film roll in cassettes screen signal to noise silver halide sodium thiosulphate U.S. Government ultra high reduction user equipment viewer Warren Spring Laboratory Xerox copies