A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 47–ի 1-ից 5-ը:
Էջ 1
... to remark the circular arrangement of the images of a candle round a centre , and the multiplication of the sectors formed by the extremities A of the plates of glass . In consequence , however INTRODUCTION-HISTORY OF THE KALEIDOSCOPE,
... to remark the circular arrangement of the images of a candle round a centre , and the multiplication of the sectors formed by the extremities A of the plates of glass . In consequence , however INTRODUCTION-HISTORY OF THE KALEIDOSCOPE,
Էջ 10
... sector A O B had before it . In like manner , if we place the edge BO of the other reflector upon the other side B o of the paper sector , a similar image Boa will be formed behind it . The origin of three of the sectors seen round o is ...
... sector A O B had before it . In like manner , if we place the edge BO of the other reflector upon the other side B o of the paper sector , a similar image Boa will be formed behind it . The origin of three of the sectors seen round o is ...
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... sector , a o B. Mr. Harris , in the xvith Prop . of his Optics , has evaded this difficulty , and given a false demonstration of the proposition . remarks , that the last sector , a oẞ is produced " by the reflection of the rays forming ...
... sector , a o B. Mr. Harris , in the xvith Prop . of his Optics , has evaded this difficulty , and given a false demonstration of the proposition . remarks , that the last sector , a oẞ is produced " by the reflection of the rays forming ...
Էջ 12
... sector , a oẞ , is not , as Mr. Harris supposes , a reflexion from either of the two last images , bo ß , a oa , but is composed of the images of two half sectors , one of which is formed by the mirror A o , and the other by the mirror ...
... sector , a oẞ , is not , as Mr. Harris supposes , a reflexion from either of the two last images , bo ß , a oa , but is composed of the images of two half sectors , one of which is formed by the mirror A o , and the other by the mirror ...
Էջ 14
... sectors which compose the circular image are formed in the very same manner as has been already described ; but as the number of reflected sectors must in FIG . 3 . B m n m ' 22 " a E m " this case always be even , the line o E , where ...
... sectors which compose the circular image are formed in the very same manner as has been already described ; but as the number of reflected sectors must in FIG . 3 . B m n m ' 22 " a E m " this case always be even , the line o E , where ...
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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.