Two Nicol prisms play the same part as the two plates of tourmaline.
"Six Lectures on Light" by John Tyndall
Among others, the carefully considered modifications of the Nicol prism which have recently been devised by Prof. S.P.
"Scientific American Supplement, No. 441, June 14, 1884." by Various
This polarizer carries one of the pair of Nicols prisms and is countersunk to allow of the introduction of gypsum or selenite plates.
"Paint Technology and Tests" by Henry A. Gardner
These sketches he sent to Mr. Nicol, who presented him in return with a pair of prisms of his own construction.
"Heroes of Science: Physicists" by William Garnett
Nicol's prism for Polarized Light.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn