A Treatise on the Kaleidoscope1858 |
From inside the book
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Page 2
... person who saw it to advantage , as one of the most beautiful in optics . " These experiments were afterwards repeated with more perfectly polished plates of different metals , and the effects were proportionally more brilliant ; but ...
... person who saw it to advantage , as one of the most beautiful in optics . " These experiments were afterwards repeated with more perfectly polished plates of different metals , and the effects were proportionally more brilliant ; but ...
Page 51
... person who is unaccustomed to the compa- rison of different lights , will find it extremely difficult to distinguish the direct sector from the reflected ones . This difficulty will be still greater if the mirrors are made of finely ...
... person who is unaccustomed to the compa- rison of different lights , will find it extremely difficult to distinguish the direct sector from the reflected ones . This difficulty will be still greater if the mirrors are made of finely ...
Page 62
... persons who are short - sighted . The proper application of the objects at the end of the reflectors is now the only step which is required to complete the simple Kaleidoscope . The method of forming , select- ing , and mixing the ...
... persons who are short - sighted . The proper application of the objects at the end of the reflectors is now the only step which is required to complete the simple Kaleidoscope . The method of forming , select- ing , and mixing the ...
Page 69
... , and shown to another person . To obviate this disadvantage , an object - box with fixed objects generally accompanies the instrument ; the pieces of spun and coloured CHAP . VIII . THE CONSTRUCTION OF OBJECT - BOXES . 69.
... , and shown to another person . To obviate this disadvantage , an object - box with fixed objects generally accompanies the instrument ; the pieces of spun and coloured CHAP . VIII . THE CONSTRUCTION OF OBJECT - BOXES . 69.
Page 72
... person to find what colours har- monize with each other , I have drawn up the following table , which contains the harmonic colours . Blue and Green , with most Blue , mixed . Deepest Red , . Red , • Blue and Green equally mixed ...
... person to find what colours har- monize with each other , I have drawn up the following table , which contains the harmonic colours . Blue and Green , with most Blue , mixed . Deepest Red , . Red , • Blue and Green equally mixed ...
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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.