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1929 The Educational acidity alkaline art glass medallions astigmatism Bausch & Lomb bird blue at pH Bugs and Butterflies Catalog Chamot Chemical Microscope Chromatic aberration Colorimeter corrected lens cross-hairs crystal angles Curvature of field defect designed for living edge educational field Educational Focus entire pH ERM Balopticon Euscope eyepiece fashioned to afford film projector find a microscope forms Gateway to Knowledge Hydrogen Hydrogen Ions HYDROGEN-ION COLORIMETRY ideal sought interested lens area Lenses are designed Lomb Binocular Lomb Microscope Lomb Optical Company Manufacturers of Optical margin matism measurement of crystal medallion of science ment Micro Projector MICRO-CHEMICAL models modern Natural Colors obtained opaque projector optical instruments ordinary lenses Orthogon Photographic Lenses potassium projection machine pupil Refractometer scientific skilfully fashioned slide projector spectacle lenses stage Stained Glass Window student symbolic Third Unitarian Church tion University of California visual aid visual education visual errors window of science