The spectroscope and its relation to photography

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Page 8 - of the wave which first reaches the medium will be the first retarded by it, the other portions, as they enter the glass, being retarded in succession."*
Page 8 - passes at an angle from one medium to another of different density, it is refracted, or bent out of its course. A
Page 73 - The only special work yet published on the subject of Enamelling. Price 2s.
Page 73 - exposition of those principles of art, the knowledge of which is useful to
Page 65 - the angle between the axes of the collimator and the observing telescope,

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