Many of the optical, electrical, and mechanical components andsystems of a recording spectropolarimeter may be used in adapting the spectropolarimeter to measure and record circular dichroism. This article describes the construction and performance characteristics of an accessory for the measurement of circular dichroism in the 6000-1850 A region on a commercially available recording spectropolarimeter, the Cary Instruments Model 60. The accessory employs an improved version of the electro-optic modulator technique. It consists of four units which are easily coupled to the spectropolarimeter. Furthermore, conversion of the spectropolarimeter to the standard mode of operation is readily achievable.