A Treatise on the Kaleidoscope1858 |
From inside the book
Արդյունքներ 19–ի 1-ից 5-ը:
Էջ 22
... greater than on , we shall have om " greater than on " ; that is , the images m ' n " , n ' m " , will not coincide . As on approaches to an equality with om , on " approaches to an equality with o m " , and when o m = on , we have on ...
... greater than on , we shall have om " greater than on " ; that is , the images m ' n " , n ' m " , will not coincide . As on approaches to an equality with om , on " approaches to an equality with o m " , and when o m = on , we have on ...
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
... greater or 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 ...
... greater or 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 ...
Էջ 32
... greater by one when the number of sectors is 3 , 7 , 11 , 15 , etc. , and the number of stationary sectors being greater by one when the number of sectors is · 5 , 9 , 13 , 17 , etc. And , 5. That as the moving sectors correspond with ...
... greater by one when the number of sectors is 3 , 7 , 11 , 15 , etc. , and the number of stationary sectors being greater by one when the number of sectors is · 5 , 9 , 13 , 17 , etc. And , 5. That as the moving sectors correspond with ...
Էջ 39
... greater , if M N O P is brought nearer the line B A , for the image m n o p will be entirely included between the lines ar and a B , so that no part whatever of the image will be visible to an eye at ɛ . As the eye of the observer moves ...
... greater , if M N O P is brought nearer the line B A , for the image m n o p will be entirely included between the lines ar and a B , so that no part whatever of the image will be visible to an eye at ɛ . As the eye of the observer moves ...
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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.