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Abney and Watson Acheson acuity Alumina amorphous graphite amount annulus aperture appear Aquadag background binocular black paper brightness carbon cent coefficient of friction colloidal graphite colloidal lubricants colloidal solid lubricants Council for Scientific cylinder oil darkness dead black deflocculated Department of Scientific diameter diluted disc effect employed Equivalent Sector exit.pupil eyepiece Ferric oxide field of view film filtered oils flocculation fovea gear graphite content grease hot bearings impurities increased Industrial Research instrument internal combustion engines light Log angular subtense Log Illumination Log Subtense luminosity magnification magnifying power Memorandum metallic mica mineral oil mixed mixture naked eye tests natural graphite NIGHT-GLASSES Observer Oildag particles petroleum acid piston pointer Price produced pupil Report Research Association retinal rubbing surfaces Scientific and Industrial screen sector value semi-solid lubricants separation Silica slope specific gravity steam cylinder steam engines steatite subtense in minutes Table talc telescope threshold varying visibility