The economy of the eyes |
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Pagina 48
... rays from the other half , may not confuse the Eye and distress its ad- justment - which would be extremely per- plexing and detrimental to the Eyes , to which it would be as bothering , as it would be to the Ears to have two Barrel ...
... rays from the other half , may not confuse the Eye and distress its ad- justment - which would be extremely per- plexing and detrimental to the Eyes , to which it would be as bothering , as it would be to the Ears to have two Barrel ...
Pagina 57
... rays of light upon the eye : have enough Light , but no more than is suffi- cient . CHAPTER XI . HINTS TO PERSONS BEGINNING TO WEAR SPECTACLES , AND OF READING LAMPS AND CANDLESTICKS . WHEN persons first put on Spectacles , if they have ...
... rays of light upon the eye : have enough Light , but no more than is suffi- cient . CHAPTER XI . HINTS TO PERSONS BEGINNING TO WEAR SPECTACLES , AND OF READING LAMPS AND CANDLESTICKS . WHEN persons first put on Spectacles , if they have ...
Pagina 59
... rays coming changed in the same proportion . But if in the day - time you place Candles in a darkened chamber that every thing therein may be well illuminated , and then retire to another place illuminated with the Sun's light - the ...
... rays coming changed in the same proportion . But if in the day - time you place Candles in a darkened chamber that every thing therein may be well illuminated , and then retire to another place illuminated with the Sun's light - the ...
Pagina 86
... rays will prevent the picture on the Retina being confused by those adventitious rays which otherwise distract it ; and if only those rays are admitted into the Eye which come direct from the object under examina- tion , it will make a ...
... rays will prevent the picture on the Retina being confused by those adventitious rays which otherwise distract it ; and if only those rays are admitted into the Eye which come direct from the object under examina- tion , it will make a ...
Pagina 92
... exposed him to the bright rays of the Sun - by which he was very soon blinded . " - G . ADAMS on Vision , 8vo . 1789 , p . 8 . gratification - the frequent sources of Disap- pointment and Pain 92 PRECEPTS FOR IMPROVING AND.
... exposed him to the bright rays of the Sun - by which he was very soon blinded . " - G . ADAMS on Vision , 8vo . 1789 , p . 8 . gratification - the frequent sources of Disap- pointment and Pain 92 PRECEPTS FOR IMPROVING AND.
Alte ediții - Afișează-le pe toate
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...