A quantitative study of pleochroic haloes—II

Abstract

The previous paper by Henderson and Bateson described a new method of studying pleochroic haloes with the aid of an instrument called a halo photometer. This method gave a quantitative permanent record of the structure of a halo, yielding accurate measurements of the various rings and also a record of the intensity of blackening throughout a halo. Thus an objective method took the place of the usual subjective study with the microscope. The following paper gives further results obtained by this method and a discussion of the results.