Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 61
ing the bands of a very high order we havethus been able to glean some information as to the con-stitution of a line in the spectrum, and have found it to 58 THE SCIENCE OF LIGHT be double. This observation of bands of a high orderis the main principle in interference spectroscopes.Some of these… … two vertical plates of perfectly plane glass of exactlyequal thickness placed parallel to one another. B andD are two perfectly plane vertical mirrors silvered ontheir front surfaces. D has adjusting screws at itsback so that it may be turned horizontally or verticallythrough a small angle. B is…
Light
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