A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 31–ի 1-ից 5-ը:
Էջ 6
... less than its triangular aperture . The next , and by far the most important step of the invention , was to remove this limitation , and to extend indefinitely the use and application of the instrument . This effect was obtained by ...
... less than its triangular aperture . The next , and by far the most important step of the invention , was to remove this limitation , and to extend indefinitely the use and application of the instrument . This effect was obtained by ...
Էջ 24
... must be imperfect . It has already been shown at the end of Chap . I. that when the angle of the mirrors becomes greater than an even or less than an odd aliquot part of a circle , each of the 24 CHAP . IL PRINCIPLES OF THE KALEIDOSCOPE .
... must be imperfect . It has already been shown at the end of Chap . I. that when the angle of the mirrors becomes greater than an even or less than an odd aliquot part of a circle , each of the 24 CHAP . IL PRINCIPLES OF THE KALEIDOSCOPE .
Էջ 25
... less than half a sector . The image of the object comprehended in each of the incomplete sectors must therefore be greater or less than the images in half a sector ; that is , when the last sector ẞo a , Fig . 2 , is greater than A o B ...
... less than half a sector . The image of the object comprehended in each of the incomplete sectors must therefore be greater or less than the images in half a sector ; that is , when the last sector ẞo a , Fig . 2 , is greater than A o B ...
Էջ 36
... less angle than the complement of the angle formed by the mirrors , then the salient angles of the opening polygon may touch the salient angles of the stationary polygon , by placing the mirrors so as to form re - entering angles in the ...
... less angle than the complement of the angle formed by the mirrors , then the salient angles of the opening polygon may touch the salient angles of the stationary polygon , by placing the mirrors so as to form re - entering angles in the ...
Էջ 44
... - But as it is im- practicable to have the eye exactly in the plane of both mirrors , the images formed by one reflexion must always be less bright than the direct object , even at 44 CHAP . IV . EFFECTS OF VARYING THE.
... - But as it is im- practicable to have the eye exactly in the plane of both mirrors , the images formed by one reflexion must always be less bright than the direct object , even at 44 CHAP . IV . EFFECTS OF VARYING THE.
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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.