The economy of the eyes |
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Pagina 22
... side of the centre , the interval of the pupils will be widened , and the refracting power of the Eyes be diminished ; so that here a disadvantage is to be added to the prejudice of the convexity of the Glass , -not a benefit to be ...
... side of the centre , the interval of the pupils will be widened , and the refracting power of the Eyes be diminished ; so that here a disadvantage is to be added to the prejudice of the convexity of the Glass , -not a benefit to be ...
Pagina 46
... side of the Room , or across the Street , and say , ' Why now I can see well enough to Read with these Glasses - but I cannot discern what that word is over yonder Door ; ' and the Optician has often- times no little trouble to convince ...
... side of the Room , or across the Street , and say , ' Why now I can see well enough to Read with these Glasses - but I cannot discern what that word is over yonder Door ; ' and the Optician has often- times no little trouble to convince ...
Pagina 48
... side , & c . but all such contri- vances are at the expense of the Eye - the Magnifying power of Spectacles has also been made to vary from 36 to 12 Inches focus , by having two Eye - glasses , of 72 inches focus , one before the other ...
... side , & c . but all such contri- vances are at the expense of the Eye - the Magnifying power of Spectacles has also been made to vary from 36 to 12 Inches focus , by having two Eye - glasses , of 72 inches focus , one before the other ...
Pagina 83
... side of his win- dow , " that when I look at that portrait oppo- site to me , it looks Warm with my left Eye , and Cold with my Right ; i . e . with my Left Eye , which is from the window , it appears * We can never be certain that an ...
... side of his win- dow , " that when I look at that portrait oppo- site to me , it looks Warm with my left Eye , and Cold with my Right ; i . e . with my Left Eye , which is from the window , it appears * We can never be certain that an ...
Pagina 89
... side or from behind . " It is requisite always to have an equal , well regulated Light in every employment , particu- larly in the Evening ; the Eye may be seriously strained and injured by working , writing , or reading with either too ...
... side or from behind . " It is requisite always to have an equal , well regulated Light in every employment , particu- larly in the Evening ; the Eye may be seriously strained and injured by working , writing , or reading with either too ...
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...