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16mm objective actual optical adjust ALAN VALENTINE President American Chemical Society amper arc condenser aperture arc lamp Bausch & Lomb Bay Meadows binocular burning crater cameras carbon arc carbons and lamp centered chemistry closed substage complete compound microscope condenser focal length crater image dead-heat demonstrate denser Earl Forman engineering field of view film focus Glass Exhibit heat filter horizontal carbon horses i6mm illumination immersion contact instru jockeys lamp condenser Lenses light beam Lomb Baltar Lomb Model Lucia's ment micro Micro-Projector Microscope Exhibit Microscope Vertical Motion pictures nation numerical aperture object slide ocular oil immersion objective opportunity optical instruments optical science Oswald and Earl Oswald Photo Patrol Patrol and Photo photo-finish picture Photograph projection race Scientific Instrument scientific optical shortage of scientists Sir Bob stewards substage condenser diaphragm substage iris diaphragm Substage Mirror tion track ture turn Turtox University of Rochester young scientists