An Essay on Visual Glasses: (vulgarly Called Spectacles) Wherein it is Shewn, from the Principles of Optics, and the Nature of the Eye, that the Common Structure of Those Glasses is Contrary to the Rules of Art, to the Nature of Things, &c. and Very Prejudicial to the Eyes. The Nature of Vision in the Eye Explained, and Glasses of a New Construction Proposed. The Whole Illustrated by a Large Copper-plate Print. By B. Martin |
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12 Inches anſwer Aperture Apparatus appear Axes Axis Ball and Socket beſt Bottom Braſs called Caſe Circle coincide Colour common common Spectacles confuſed conſequently conſidered Conſtruction contrary convex Cornea Courſe curious Diameter directed Diſtance diſtinct Ditto enter the Eye expect fall Focus Foot Form Frames Glaſs Glaſs G H greateſt Half Hand Horn Humour Image immediately Inches Inſtruments Invention jects known leaſt leſs Line Look Manner Means Microſcope moſt moved muſt Nature nearly neceſſary noble Notice Object obſerve optic Nerve Optics paſſing perfect Perſon Piece placed plain Pocket Point Poſition poſſible proper Proportion Pupil Purpoſes Quantity of Light Rays of Light Reading Reaſon receive reflecting refracted require Retina ſaid ſame ſcrewed ſee ſhall ſhould Side ſince ſmall Solar Spectacles ſuch ſufficient Surface Teleſcope theſe Things thoſe tranſparent Tube turn Uſe Viſion viſual Glaſſes Wilſon's Wood
