A Treatise on the Kaleidoscope1858 |
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Page 23
... consists of a direct and an inverted form , so joined as to form a compound form . Now the compound form made up by each pair obviously constitutes a symmetrical picture when multiplied any num- ber of times , whether even or odd ; but ...
... consists of a direct and an inverted form , so joined as to form a compound form . Now the compound form made up by each pair obviously constitutes a symmetrical picture when multiplied any num- ber of times , whether even or odd ; but ...
Page 35
... consists of two polygons with salient and re - entering angles . By moving the mirrors along one of the lines , so that it may always cross the aperture at the same angle , and at the same distance from the angular point , the polygon ...
... consists of two polygons with salient and re - entering angles . By moving the mirrors along one of the lines , so that it may always cross the aperture at the same angle , and at the same distance from the angular point , the polygon ...
Page 42
... consist of two parts in complete contact , one of which is an inverted image of the other . But in order that an object possessing perfect symmetry may appear perfectly symmetrical , four conditions are required . The two halves of the ...
... consist of two parts in complete contact , one of which is an inverted image of the other . But in order that an object possessing perfect symmetry may appear perfectly symmetrical , four conditions are required . The two halves of the ...
Page 50
... consist of lines all lying in the same plane , and in contact with the reflectors . Hence it is obvious , that objects whose thickness is perceptible , cannot give mathematically symmetrical patterns , for one side of them must always ...
... consist of lines all lying in the same plane , and in contact with the reflectors . Hence it is obvious , that objects whose thickness is perceptible , cannot give mathematically symmetrical patterns , for one side of them must always ...
Page 62
... consists in bringing the tube about half an inch beyond the ends of the reflectors . A circular piece of thin plane glass of the same diameter as the tube , is then pushed into the tube , 62 CHAP . VII . CONSTRUCTION AND USE OF.
... consists in bringing the tube about half an inch beyond the ends of the reflectors . A circular piece of thin plane glass of the same diameter as the tube , is then pushed into the tube , 62 CHAP . VII . CONSTRUCTION AND USE OF.
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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.