A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 23–ի 1-ից 5-ը:
Էջ 14
... consider the effects which will be produced when this is not the case . If the angle A O B , Fig . 2 , is made to increase from being an even aliquot part of a circle , such as th , till it becomes an odd aliquot part , such as 4th ...
... consider the effects which will be produced when this is not the case . If the angle A O B , Fig . 2 , is made to increase from being an even aliquot part of a circle , such as th , till it becomes an odd aliquot part , such as 4th ...
Էջ 19
... consider that the simple form mn , Fig . 2 , is seen by direct vision through the open sector A O B , and that the image n o , of the object m n , formed by one reflexion in the sector B o a , is necessarily an inverted image . But ...
... consider that the simple form mn , Fig . 2 , is seen by direct vision through the open sector A O B , and that the image n o , of the object m n , formed by one reflexion in the sector B o a , is necessarily an inverted image . But ...
Էջ 23
... considering that the symmetrical picture formed by the Kaleidoscope contains half as many pairs of forms as the number of times that the inclination of the mirrors is con- tained in 360 ° ; and that each pair consists of a direct and an ...
... considering that the symmetrical picture formed by the Kaleidoscope contains half as many pairs of forms as the number of times that the inclination of the mirrors is con- tained in 360 ° ; and that each pair consists of a direct and an ...
Էջ 26
... consider the effects produced by the motion of the object when the mirrors are at rest . FIG . 9 . P E If the object moves from x to o , Fig . 9 , in the direction of the radius , all the images will likewise move towards o , and the ...
... consider the effects produced by the motion of the object when the mirrors are at rest . FIG . 9 . P E If the object moves from x to o , Fig . 9 , in the direction of the radius , all the images will likewise move towards o , and the ...
Էջ 27
... considering that the image must be formed at points similarly situated behind the mirrors ; the line passing through these points will be the path of the image , and the order in which the images succeed each other will give the ...
... considering that the image must be formed at points similarly situated behind the mirrors ; the line passing through these points will be the path of the image , and the order in which the images succeed each other will give 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.