 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...  The economy of the eyes - Pagina 100de William Kitchiner - 1824Vizualizare completă - Despre această carte
 | William Charles Wells - 1818 - 554 pagini
...to the King. IN OPTICS. skilled in the theory of vision, but, from his situation, as an artist, has better opportunities, than most persons, of learning...had been accustomed to apply them to one eye only. This indeed may have happened by accident ; but at any rate, the fact is worthy of farther attention... | |
 | William Charles Wells - 1818 - 536 pagini
...Instrument Maker to the King. skilled in the theory of vision, but, from his situation, as an artist, has better opportunities, than most persons, of learning...had been accustomed to apply them to one eye only. This indeed may have happened by accident ; but at any rate, the fact is worthy of farther attention... | |
 | John Harrison Curtis - 1833 - 270 pagini
...highly-celebrated optician, asserted that he did not recollect an instance of a short-sighted person who had occasion to increase the depth of his glasses, if he began with spectacles: but, on the other hand, he knew many cases where only one eye had been used, in which... | |
 | Richard Middlemore - 1835 - 938 pagini
...treatment. * DR. WELLS states, on the authority of MR. ADAMS, a celebrated mathematical instrument maker, " that he does not know a shortsighted person, who has...had been accustomed to apply them to one eye only." An Essay upon single vision with two eyes, together with experimentt and observations on several other... | |
 | 1847 - 592 pagini
...Observations (London, 1818), stales that he was informed by Mr. George Adams, an eminent optician, ' that he does not know a short-sighted person who has...obliged to change their concave glasses repeatedly for those of higher powers who had been accustomed to apply them to one eye only.' " The above is a fact... | |
 | 1847 - 600 pagini
...Observations (London, 1818), states that he was informed by Mr. George Adams, an eminent optician, ' that he does not know a short-sighted person who has...where those have been obliged to change their concave glassesrepeatedly for those of higher powers who had been accustomed to apply them to one eye only.'... | |
 | 1847 - 590 pagini
...Observations (London, 1818), states that he was informed by Mr. George Adams, an eminent optician, 'that he does not know a short-sighted person who...instances where those have been obliged to change their coucave glasses repeatedly for those of higher powers who had been accustomed to apply them to one... | |
 | Francis West - 1852 - 70 pagini
...sufficiently concave to afford the assistance that the eye requires." Mr. Q-. Adams has noticed the fact, that he does not know a short-sighted person who has...occasion to increase the depth of his glasses, if he commenced using them in the form of spectacles ; whereas he can recollect several instances where those... | |
 | William White Cooper - 1853 - 340 pagini
...experiments and observations, states that he was informed by Mr. George Adams, an eminent optician, " that he does not know a short-sighted person who has...obliged to change their concave glasses repeatedly for those of higher powers who had been accustomed to apply them to one eye only." The above is a fact... | |
 | Sir William Lawrence - 1854 - 966 pagini
...theory of vision, but, from his situation as an artist, has better opportunities than most person?, of learning such matters. The fact is this, that he...powers, who had been accustomed to apply them to one eye.'1 " Double concave glasses are numbered 1, 2, 3, &c., beginning with the longest focus, or shallowest... | |
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