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Re: POLARIZATION


Hugh Logan
Jenkins and White also describe another Polaroid film known as
H-Polaroid: "Land and Rogers found further that when an oriented
transparent film of polyvinyl alcohol is heated in the presence of an
active dehydrating catalyst such as hydrogen chloride, the film darkens
slightly and becomes strongly dichroic. Such a film becomes very stable
and, having no dyestuffs, is not bleached by strong sunlight." (p. 505).

Typo correction: The Polaroid film referred to above should have been
K-Polaroid. H-Polaroid had already been discussed.

Hugh Logan