A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 19–ի 1-ից 5-ը:
Էջ 13
... removed by looking through a very small aperture at E. As the preceding remarks are equally true , whatever be the inclination of the mirrors , provided it is an even aliquot part of a circle , it follows , - 1. That when A O B is 1 , 1 ...
... removed by looking through a very small aperture at E. As the preceding remarks are equally true , whatever be the inclination of the mirrors , provided it is an even aliquot part of a circle , it follows , - 1. That when A O B is 1 , 1 ...
Էջ 38
... removed . In the following observations , therefore , it is understood that the images are reflected either from a polished metallic surface , or from the first surface of glass . In order to explain the effects produced upon the sym- m ...
... removed . In the following observations , therefore , it is understood that the images are reflected either from a polished metallic surface , or from the first surface of glass . In order to explain the effects produced upon the sym- m ...
Էջ 48
... removing the object beyond the plane passing through AO B. In this case the pattern will lose its symmetry from two causes . In the first place , it is manifest , as already explained , that as the eye is necessarily raised a little ...
... removing the object beyond the plane passing through AO B. In this case the pattern will lose its symmetry from two causes . In the first place , it is manifest , as already explained , that as the eye is necessarily raised a little ...
Էջ 49
... removal of the object from the extremity of the reflectors , increases as the object approaches to the centre of the lumi- nous sectors or the circular field , and this deviation becomes D E so perceptible , that an eye accustomed to ...
... removal of the object from the extremity of the reflectors , increases as the object approaches to the centre of the lumi- nous sectors or the circular field , and this deviation becomes D E so perceptible , that an eye accustomed to ...
Էջ 50
... that this limitation may be removed by an optical contrivance , which extends indefi- nitely the use and application of the instrument . CHAPTER VI . ON THE INTENSITY OF THE LIGHT IN 50 EFFECTS OF VARYING POSITION OF OBJECT . CHAP . V.
... that this limitation may be removed by an optical contrivance , which extends indefi- nitely the use and application of the instrument . CHAPTER VI . ON THE INTENSITY OF THE LIGHT IN 50 EFFECTS OF VARYING POSITION OF OBJECT . CHAP . V.
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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.