A method of modulating the light beams of the G.E. recording spectrophotometer is described, which does not involve the use of a polarizing prism, thus obviating de-cementing faults in the prism due to heating during prolonged operational periods. The performance of the modified instrument and its use in measurements of dichroism of dyed films are discussed.
E. ATHERTON, "A Nonpolarizing Light Modulator for the General Electric Recording Spectrophotometer," J. Opt. Soc. Am. 45, 130-131 (1955)