(1) Set of 13 2"x2" optically polished chance glass filters from 2.5 to 3.0 mm thick.
(2) Set of 17 4"x4" transluscent glass filters with detailed descriptions of each, including some transmission curves.
Also available on request are the following sets from other demonstrations:
(1) A set of Kodak Wratten filters, used with some of the other demonstrations, including N3-05: COLOR MIXING VIA CHROMATICITY DIAGRAM.
(2) Sets of precision positive and negative lantern slide filters, which are used in demonstrations N3-21 and N3-22.