Abstract

The Fery prism, first described in 1910, has been used in relatively few applications, all of these apparently being in spectrographs. The present paper describes the application of a borosilicate crown glass Fery prism as the dispersive element in a monochromator covering the spectral range from 320 mµ to 1000 mµ. Performance characteristics of the prism are given. A new Beckman spectrophotometer employing the Fery prism is described along with its performance characteristics. A novel wave-length control mechanism and a new slit device are described.

© 1949 Optical Society of America

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