Abstract
THE possibility of evaporating in vacuum an optically active film of an otherwise isotropic material, by oblique deposition on to a flat glass substrate revolving about its normal as an axis, is confirmed. The helically deposited fluorite films ranged up to about 18µ thick, and turned the plane of polarization of a normally incident beam by as much as 2.25° at λ = 0.546µ.
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