A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 22–ի 1-ից 5-ը:
Էջ 15
... complete sectors , or equal to A O B. If the angle A O B is made to vary from th to 4th of a circle , the last sector ẞo a will gradually diminish , in con- sequence of each of its halves , ẞo e , a o e , diminishing ; and just when the ...
... complete sectors , or equal to A O B. If the angle A O B is made to vary from th to 4th of a circle , the last sector ẞo a will gradually diminish , in con- sequence of each of its halves , ẞo e , a o e , diminishing ; and just when the ...
Էջ 23
... complete and symme- trical picture , only in the case when the object is similarly situated with respect to both the mirrors ; the two last sectors forming , in every other position of the object , an imperfect junction , in consequence ...
... complete and symme- trical picture , only in the case when the object is similarly situated with respect to both the mirrors ; the two last sectors forming , in every other position of the object , an imperfect junction , in consequence ...
Էջ 42
... 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 object must be so placed ...
... 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 object must be so placed ...
Էջ 45
... complete union of the images --- to represent similar parts of the object and its images— to observe the object and its image under the same angular magnitude , and to give a maximum intensity of light to the reflected images — should ...
... complete union of the images --- to represent similar parts of the object and its images— to observe the object and its image under the same angular magnitude , and to give a maximum intensity of light to the reflected images — should ...
Էջ 62
... complete the simple Kaleidoscope . The method of forming , select- ing , and mixing the objects , will be described in the next chapter . At present , we shall confine our attention to the various methods which may be employed in ...
... complete the simple Kaleidoscope . The method of forming , select- ing , and mixing the objects , will be described in the next chapter . At present , we shall confine our attention to the various methods which may be employed in ...
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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.