A Treatise on the Kaleidoscope1858 |
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Page 1
... 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,
... 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,
Page 10
... round the centre o , as shown in Fig . 2 . In order to understand how this effect is produced , let us take a small sector of white paper of the shape A O B , Fig . 2 , and having laid it on a black ground , let the ex- tremity A o of ...
... round the centre o , as shown in Fig . 2 . In order to understand how this effect is produced , let us take a small sector of white paper of the shape A O B , Fig . 2 , and having laid it on a black ground , let the ex- tremity A o of ...
Page 17
... round a centre , it is impossible by any art to combine them into a symmetrical and beautiful picture . The regularity of their arrangement may give some satisfaction to the eye , but the adjacent forms can never join , and must ...
... round a centre , it is impossible by any art to combine them into a symmetrical and beautiful picture . The regularity of their arrangement may give some satisfaction to the eye , but the adjacent forms can never join , and must ...
Page 18
... round a centre . In this case every part of the figure is united , and forms a FIG . 4 whole , in which there is nothing redundant and nothing deficient ; and this is the precise effect which is produced by the application of the ...
... round a centre . In this case every part of the figure is united , and forms a FIG . 4 whole , in which there is nothing redundant and nothing deficient ; and this is the precise effect which is produced by the application of the ...
Page 28
... round the angular point , or rather round the common section of the two mirrors . The picture created by the Instrument seems to be composed of two pictures , one in motion round the centre of the circular field , and the other at rest ...
... round the angular point , or rather round the common section of the two mirrors . The picture created by the Instrument seems to be composed of two pictures , one in motion round the centre of the circular field , and the other at rest ...
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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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Page 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.