Each successive layer of TN molecules will gradually twist until the uppermost layer is at a 90-degree angle to the bottom, matching the polarized glass filters.

In permanent installations and some theatrical uses, colored glass filters or dichroic filters are being used.

He invented an enlarging camera (1852), a blue glass filter, and announced, but did not develop, a color photographic process (1856).

He inspected the glass filter again.

If the final layer is matched up with the second polarized glass filter, then the light will pass through.

Throughout the 19th century "color healers" claimed colored glass filters could treat many diseases including constipation and meningitis.

Harvey Cory patented his glass filter rod design (No. 114097), for which the patent was granted in 1939.

These filters were specified as particular combinations of glass filters and photomultiplier tubes.

Originally, three glass filters whose transmittance spectra mimicked the CIE color matching functions (shown on the right) were employed.

His glass filter removed the visible components of a light beam, leaving only the 'invisible radiation' as a signal beam.