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The Economy of the Eyes: Precepts for the Improvement and Preservation of the Sight; Plain Rules Which Will Enable All to Judge Exactly When, and What ... on Opera Glasses and Theatres, and an Accoun
William Kitchiner
Paperback. Forgotten Books 2015-09-27.
ISBN 9781332290574
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Förlagets beskrivning
Excerpt from The Economy of the Eyes: Precepts for the Improvement and Preservation of the Sight; Plain Rules Which Will Enable All to Judge Exactly When, and What Spectacles Are Best Calculated for Their Eyes; Observations on Opera Glasses and Theatres, and an Account of the Pancratic Magnif
Explanation of the Plate fronting the Title
Fig. I. Is the Spectacle front recommended for Eyes in general; the distance between the centres of the openings which held the Glasses being 2 1-2 inches, i.e. the average distance between the centres of the Eyes.
Fig. II. Is a portrait of the Pupil of the Eye when in a state of expansion. See Chapter XII. page 73, and No, X. of the Appendix.
Fig. III. The Pupil in its most contracted state. See page 73, &c.
Fig. IV. Convenient double Folding Hand Spectacles. See page 20.
Fig. V. A Preserver, or the First Sight for Long Sighted Eyes, i.e. a Convex lens of 36 inches focus cut in half to shew its form, c.the thickness of it at the middle and at the margin of it. See page 27.
Fig. VI. The 8th Sight, for Long Sighted Eyes or 12 Inches focus. Fig. VII. No.1 Concave, or the First Sight for Short Sighted Persons. See Chapter XIII. page 85.
Fig. VIII. No.12 Concave, or the 12th Sight for Short Sighted Persons.
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The Economy of the Eyes: Precepts for the Improvement and Preservation of the Sight; Plain Rules Which Will Enable All to Judge Exactly When, and What ... on Opera Glasses and Theatres, and an Accoun
Bokrecensioner » The Economy of the Eyes: Precepts for the Improvement and Preservation of the Sight; Plain Rules Which Will Enable All to Judge Exactly When, and What ... on Opera Glasses and Theatres, and an Accoun
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