Last year I talked many times about the Fresnel triprism in this website. Recently our research work about this composite prism was published in Optics Express where we make an analogy with the famous Stern-Gerlach experiment.

Almost at the same time, we have published a more divulgative report about the history of the Fresnel Triprism in a special issue of the journal Photoniques from the French Optical Society I hope it is an interesting reading for you.