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Isn't the drawing misleading here? I think some of the e-ray is also reflected at the gap, just due to ordinary Fresnel reflection. The transmitted beam is 100% polarized. The reflected beam is not.--Srleffler 16:52, 10 January 2006 (UTC)[reply]

Anybody know if this is the original paper, where the invention of this prism was reported? (I don't have access to this journal):

• J F Archard and A M Taylor (1948). "Improved Glan-Foucault Prism". J. Sci. Instrum. 25: 407–409.

Abstract. The modified Glan-Foucault prism described has advantages over the normal type due to the reduction of multiple reflexions in the air film. The prism is quite economical in the use of calcite when cut from the original rhomb.

Confirmed—the fact that this is the original publication is mentioned in the Handbook of Optics (cite in article).--Srleffler (talk) 05:14, 12 September 2008 (UTC)[reply]