Polaroid

This invention aligns organic crystals and embeds them in clear plastic. Polaroid replaced Iceland spar in scientific instruments that relied on polarized light and was also used in automobile windshields and spectacles.
 Edwin Herbert Land United States 1932 Polaroid

This invention aligns organic crystals and embeds them in clear plastic. Polaroid replaced Iceland spar in scientific instruments that relied on polarized light and was also used in automobile windshields and spectacles.