Abstract

An automatic recording spectrophotometer for the visible, especially adapted for the study of cathodoluminescent materials, is described. It consists of a demountable light source and an interrupter, a glass monochromator with compensation for the variation of the dispersion with wave-length, a photoelectric electron multiplier, a signal amplifier stabilized by negative feedback, and a motor drive amplifier controlling the deflection of the recording head. The wave-length scale is made linear by the introduction of a spiral cam of appropriate form. The system is distinguished by high sensitivity (usable for sources emitting one millilumen/cm2), high speed ( 114 minutes for a record), linear wave-length scale, high stability and easy adjustment.

© 1939 Optical Society of America

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