Left to right:
Pyramidal Prism
This glass prism is in the shape of a square-based pyramid.
Its design produces four spectra. It was purchased and used
for optic research.
Conical Prism
This prism in a cone shape produces a circular spectrum.
Polyprism
This prism is made of ten different kinds of glass glued
together. Each kind of glass scatters light in a different
way which produces spectra of different sizes.
