A Treatise on the Kaleidoscope1858 |
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Page 16
... means of which the princi- ples of the Instrument may be illustrated , and they go no farther than to explain the formation of an apparent circular aperture by means of successive reflexions . All the various forms which nature and art ...
... means of which the princi- ples of the Instrument may be illustrated , and they go no farther than to explain the formation of an apparent circular aperture by means of successive reflexions . All the various forms which nature and art ...
Page 25
... means of two mirrors , whose inclination is not an aliquot part of a circle , is impossible . When the angle ẞo a is greater than p o o , or A O B , the lines q v , v p , will form a re - entering angle towards o , and when it is less ...
... means of two mirrors , whose inclination is not an aliquot part of a circle , is impossible . When the angle ẞo a is greater than p o o , or A O B , the lines q v , v p , will form a re - entering angle towards o , and when it is less ...
Page 53
... means of the following table , which shows the number of rays reflected at various angles of incidence , the number of incident rays being supposed to be 1000. Part of this table was computed by Bouguer for plate - glass not quick ...
... means of the following table , which shows the number of rays reflected at various angles of incidence , the number of incident rays being supposed to be 1000. Part of this table was computed by Bouguer for plate - glass not quick ...
Page 59
... means absolutely necessary , for if the eye is properly placed , the reflexions from the posterior surface will scarcely affect the distinctness of the picture , unless in very intense lights . If it should be thought necessary to ...
... means absolutely necessary , for if the eye is properly placed , the reflexions from the posterior surface will scarcely affect the distinctness of the picture , unless in very intense lights . If it should be thought necessary to ...
Page 62
... means the observer will see with perfect distinctness the objects placed at the object end of the Kaleidoscope . This lens , however , must be removed when the instrument is to be used by persons who are short - sighted . The proper ...
... means the observer will see with perfect distinctness the objects placed at the object end of the Kaleidoscope . This lens , however , must be removed when the instrument is to be used by persons who are short - sighted . The proper ...
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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.