963 resultados para Belsham, Thomas, 1750-1829.


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Thomas Young (1773-1829) carried out major pioneering work in many different subjects. In 1800 he gave the Bakerian Lecture of the Royal Society on the topic of the “mechanism of the eye”: this was published in the following year (Young, 1801). Young used his own design of optometer to measure refraction and accommodation, and discovered his own astigmatism. He considered the different possible origins of accommodation and confirmed that it was due to change in shape of the lens rather than to change in shape of the cornea or an increase in axial length. However, the paper also dealt with many other aspects of visual and ophthalmic optics, such as biometric parameters, peripheral refraction, longitudinal chromatic aberration, depth-of-focus and instrument myopia. These aspects of the paper have previously received little attention. We now give detailed consideration to these and other less-familiar features of Young’s work and conclude that his studies remain relevant to many of the topics which currently engage visual scientists.

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In addition to his work on physical optics, Thomas Young (1773-1829) made several contributions to geometrical optics, most of which received little recognition in his time or since. We describe and assess some of these contributions: Young’s construction (the basis for much of his geometric work), paraxial refraction equations, oblique astigmatism and field curvature, and gradient-index optics.

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While recent studies of the novel have turned their attention to the diverse experimentalism of mid-century fiction, a number of significant Irish novels of the period remain under-represented in such work. William Chaigneau, Thomas Amory, Charles Johnstone and Henry Brooke are discussed as experimental novelists, extending the 'new species of writing' by their incorporation of theology and politics, education and philosophy within a fictional frame.

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Indenture between Joseph Hamilton of late of Queenston by his attorney Samuel Street to Jonathan Hart and Thomas Hart of Queenston for the sale of land in the township of Saltfleet, Lot no. 8 in the 6th Concession. There are holes in the document and the back is stained, but this does not affect the text, November 9, 1829.

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Letter to the Honourable William Dickson from Thomas Clark. Mr. Clark says that he would have been off a week ago if not for the Robert Hamilton arbitration. There is a hole in this letter and a slight bit of the text is affected (3 ½ pages, handwritten), April 14, 1829.