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The Economy of the Eyes: Precepts for the Improvement and Preservation of ...
No preview available - 2015
30 Inches focus Achromatic Telescope Adams on Vision adjust appear Artists assistance become bright Candlelight centre CHAPTER CHARLES BLAGDEN Colour Common Eye concave glass Convex Glasses Convex Lens Cook's Oracle defect degree distance distant objects distinct vision distinctly Dollond Double Stars Drury Lane Theatre Ears enable Engraving exactly extremely Eye Glasses Eye-glass Eye-lids fatigued feet field of view focal length give half in diameter Herschel inch in diameter inches aperture increased Instrument Jesse Ramsden Lamp larger less light look Magnifying power naked Eye Near-sighted Newtonian nifying power Night observed Opera Glass Optician pair of Spectacles Pancratic Eye-tube pencil of rays perfectly Peter Dollond Phil Plate proper proportion Pupil Reader require retina seen seldom Senses sensibility shew Short-sighted Persons Sight Single Object-glass sliding tubes soon Spec Spectacle frame Spectacle Glasses tacles Tele Theatre tion Trans William Kitchiner