A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 24–ի 1-ից 5-ը:
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... increased with the distance of the object . The use of the instrument was therefore limited to objects in contact with the ends of the reflectors , or held close to them , and consequently to objects , or groups of objects , whose ...
... increased with the distance of the object . The use of the instrument was therefore limited to objects in contact with the ends of the reflectors , or held close to them , and consequently to objects , or groups of objects , whose ...
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... increasing in proportion as the length increases . When these two plates are put together at an angle of 60 ° , or the sixth part of a circle , as shown in Fig PRELIMINARY PRINCIPLES , ETC. 9 -PRELIMINARY PRINCIPLES RESPECTING THE ...
... increasing in proportion as the length increases . When these two plates are put together at an angle of 60 ° , or the sixth part of a circle , as shown in Fig PRELIMINARY PRINCIPLES , ETC. 9 -PRELIMINARY PRINCIPLES RESPECTING THE ...
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... increase from being an even aliquot part of a circle , such as th , till it becomes an odd aliquot part , such as 4th , the last reflected image Boa , composed of the two halves ẞ o e , a o e , will gra- dually increase , in consequence ...
... increase from being an even aliquot part of a circle , such as th , till it becomes an odd aliquot part , such as 4th , the last reflected image Boa , composed of the two halves ẞ o e , a o e , will gra- dually increase , in consequence ...
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David Brewster. dually increase , in consequence of each of the halves in- creasing ; and when A O B becomes th of the circle , the sector Bo a will become double of △ O B , and ɑoe , Boe will become each complete sectors , or equal to ...
David Brewster. dually increase , in consequence of each of the halves in- creasing ; and when A O B becomes th of the circle , the sector Bo a will become double of △ O B , and ɑoe , Boe will become each complete sectors , or equal to ...
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... consists of direct and inverted pictures of the object , the number of direct pictures being always equal to half the number of sectors increased by one , when the number of sectors CHAP . II . PRINCIPLES OF THE KALEIDOSCOPE . 23.
... consists of direct and inverted pictures of the object , the number of direct pictures being always equal to half the number of sectors increased by one , when the number of sectors CHAP . II . PRINCIPLES OF THE KALEIDOSCOPE . 23.
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Common terms and phrases
A O E aliquot angle A O B angles of incidence angular aperture angular point aperture A O B apparent magnitude beauty brass rim broad milled Camera Obscura cell centre CHAPTER circle circular field coloured glass combination composed cone construction convex lens direct vision distance effects produced equal exhibited Fcap figure fixed focal length History images formed inches inclination instrument inverted image JOHN WILSON CROKER Kaleido Kaleidoscope last sector light luminous m n o p manner metallic motion move object-box object-plate objects placed obliquely observer optical pieces plane mirrors plates of glass polygon Portrait position Post 8vo preceding principles rays re-entering angles reflected images regular polygon ring round salient angles screw Second Edition seen by direct shown in Fig side speculum metal square stationary symmetrical picture Third Edition three reflectors tion triangle tube velocity Vols Woodcuts
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Էջ 1 - Medal, the reflectors were in some cases inclined to each other, and he had occasion to remark the circular arrangement of the images of a candle round a centre, or the multiplication of the sectors formed by the extremities of the glass plates. In repeating, at a subsequent period, the experiments of M. Biot on the action of fluids upon light, Dr B.