The economy of the eyes |
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... Concave Eye - glasses for varying the To ascertain the relative Powers of Eye- Glasses ... Imperfections in Opera Glasses , to dis- cover . Prices of Opera Glasses Cautions in trying Opera Glasses Comparisons of Single and Double Ob ...
... Concave Eye - glasses for varying the To ascertain the relative Powers of Eye- Glasses ... Imperfections in Opera Glasses , to dis- cover . Prices of Opera Glasses Cautions in trying Opera Glasses Comparisons of Single and Double Ob ...
Pagina viii
... CONCAVE , or the First Sight for Short Sighted Persons . See Chapter XIII . page 94 . FIG . VIII . No. 12 Concave , or the 12th Sight for Short Sighted Persons . The Plate of the Pancratic Eye - Tube and Double Stars to face page 130 ...
... CONCAVE , or the First Sight for Short Sighted Persons . See Chapter XIII . page 94 . FIG . VIII . No. 12 Concave , or the 12th Sight for Short Sighted Persons . The Plate of the Pancratic Eye - Tube and Double Stars to face page 130 ...
Pagina 25
... Concave which is called , by Opticians , " No. O. Concave , " or " Half a Number " - they will find it give a decided outline to distant objects , which they never saw defined sharply before . - However , people who do not use their ...
... Concave which is called , by Opticians , " No. O. Concave , " or " Half a Number " - they will find it give a decided outline to distant objects , which they never saw defined sharply before . - However , people who do not use their ...
Pagina 30
... for a Short Sight , that which is the least concave , and gives the least assistance to the Eye , is called No. 1. See Figure 7 in the Plate fronting the Title . which is one of the natural and unavoidable consequences of 30 OF PRESERVERS .
... for a Short Sight , that which is the least concave , and gives the least assistance to the Eye , is called No. 1. See Figure 7 in the Plate fronting the Title . which is one of the natural and unavoidable consequences of 30 OF PRESERVERS .
Pagina 72
... Concave - To enable my Readers to measure the re- spective merits , and the relative reflective powers of Convex , and Plane Small Specula - I shall lay before them , an abstract of their several pretensions as stated by preceding ...
... Concave - To enable my Readers to measure the re- spective merits , and the relative reflective powers of Convex , and Plane Small Specula - I shall lay before them , an abstract of their several pretensions as stated by preceding ...
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The Economy of the Eyes: Precepts for the Improvement and ..., Partea 1 William Kitchiner Vizualizare completă - 1824 |
Termeni și expresii frecvente
30 inches focus Achromatic Telescope ADAMS on Vision adjust aperture appear Artists assistance become bright Candlelight centre CHAPTER CHARLES BLAGDEN Colour Common Eye concave glass Convex Glasses COOK'S ORACLE 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 HERSCHEL inch in diameter inches aperture increased injurious 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 save the King seen seldom Senses sensibility shew Short-sighted Persons Sight Single Object-glass sliding tubes soon Spec Specta Spectacle frame Spectacle Glasses tacles Tele Theatre tion Trans WILLIAM KITCHINER
Pasaje populare
Pagina 21 - Why has not man a microscopic eye ? For this plain reason, man is not a fly.
Pagina 205 - Prescrib'd her heights, and prun'd her tender wing, (Her guide now lost) no more attempts to rise, But in low numbers short excursions tries: Content, if hence, th...
Pagina 199 - And speak, though sure, with seeming diffidence; Some positive persisting fops we know, Who if once wrong will needs be always so; But you with pleasure own your errors past, And make each day a critique on the last.
Pagina 107 - A man of sense sees, hears and retains everything that passes where he is. I desire I may never hear you talk of not minding, nor complain, as most fools do, of a treacherous memory. Mind not only what people say, but how they say it; and if you have any sagacity you may discover more truth by your eyes than by your ears. People can say what they will, but they cannot look just as they will; and their looks frequently discover what their words are calculated to conceal.
Pagina 28 - ... eye than you have been accustomed to do, and desire the aid of plenty of light ; and on looking at a near object, it becomes confused, and appears to have a kind of mist before it, and the letters of a book run one into another, or appear double, &c. ; and BY CANDLELIGHT you catch yourself holding a book &c. close behind the candle.
Pagina 100 - The fact is this, that he does not know a shortsighted person, who has had occasion to increase the depth of his glasses, if he began to use them in the form of spectacles ; whereas he can recollect several instances, where those have been obliged to change their concave glasses repeatedly, for others of higher powers, who had been accustomed to apply them to one eye only.
Pagina 16 - When persons who have long patronized One Eye, and slighted the Other, take to Spectacles, they will (generally) require Glasses of a different focus for each Eye. When You go to an Optician's to choose Spectacles, the first thing to attend to, is to look at a Book with each eye alternately, — and carefully ascertain, if You see equally well, with both Eyes, with the same Glass, at exactly the same distance.
Pagina 130 - Tis but to know how little can be known, To see all others...