First, then, we have a prism which receives the light from the electric lamp, and which is called the polarizer.
I would deny flatly that I had anything to do with the polarizer, in any case.
Introducing a plate of quartz between the polarizer and the spar, the two images glow with complementary colours.
But the cold, white glare was more intense than he had expected, and he had to shut them again and turn on the polarizer.
Big yellow eyes blinked unemotionally at the glare of the torch, and I cut down its brilliance with a twist of the polarizer lens.
Through this glass the beam from the polarizer now passes, being intercepted by the Nicol in front.
Placing the plate in front of the polarizer, I turn one of the Nicols until the two halves of the plate show a common puce colour.