The economy of the eyes |
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Pagina 13
... considerably strained , and in a short time much fatigued : and there is another objection to the use of Reading - Glasses , which arises from the un- steadiness of the hand , and the motion of the head , which occasion a perpetual ...
... considerably strained , and in a short time much fatigued : and there is another objection to the use of Reading - Glasses , which arises from the un- steadiness of the hand , and the motion of the head , which occasion a perpetual ...
Pagina 15
... labour of each Eye is considerably lessened . - * To ascertain whether an Object seen with Both Eyes , appears brighter or larger , than when seen with One Eye As the Eyes of Persons who have either a very ON READING GLASSES . 15.
... labour of each Eye is considerably lessened . - * To ascertain whether an Object seen with Both Eyes , appears brighter or larger , than when seen with One Eye As the Eyes of Persons who have either a very ON READING GLASSES . 15.
Pagina 21
... considerable care is constantly " The Single Convex Glasses with which some Persons read , must be very injurious , if they be sufficiently large to taken to always hold them exactly parallel with , and HAND SPECTACLES . 21 HAND ...
... considerable care is constantly " The Single Convex Glasses with which some Persons read , must be very injurious , if they be sufficiently large to taken to always hold them exactly parallel with , and HAND SPECTACLES . 21 HAND ...
Pagina 35
... , his Sister " Sarah had never learned to Read , " but unwilling to acknowledge her ignorance , had made him and all the Family - promise not to tell . " of the Sight , varies so considerably with differ- ent CONVEX GLASSES , & c . 35.
... , his Sister " Sarah had never learned to Read , " but unwilling to acknowledge her ignorance , had made him and all the Family - promise not to tell . " of the Sight , varies so considerably with differ- ent CONVEX GLASSES , & c . 35.
Pagina 36
William Kitchiner. of the Sight , varies so considerably with differ- ent people : - several youths under 20 years of Age , have applied to me , who could not see either to read or write , without very strong Magnifiers of 6 or 8 inches ...
William Kitchiner. of the Sight , varies so considerably with differ- ent people : - several youths under 20 years of Age , have applied to me , who could not see either to read or write , without very strong Magnifiers of 6 or 8 inches ...
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...