Formerly I had seen those tourmaline rounds of Louie Causton's grey eyes as it were transversely placed, opaque, riddling, mocking, impenetrable; now, quicker than the flicker of a camera-shutter, they had changed, and, for me, would never again change back.
"The Debit Account"
Oliver Onions
The glass which reflects the light does so at what is called the polarising angle, and between the eye-piece and the eye is a plate of tourmaline.
"The Story of the Heavens"
Robert Stawell Ball
This plate of tourmaline can be turned round by the observer.
"The Story of the Heavens"
Robert Stawell Ball