Signedunsigned
Inscribedin pencil script on top: T. L. L
in orange paint: H
FunctionThis prism is used like a right angle prism to divert light by means of internal reflection on the longest face. Light rays would be diverted by 120°.
Historical AttributesLikely used by Theodore Lyman.
ProvenanceLikely from Theodore Lyman's lab; later used in the Harvard College Optics Lab, and transferred to CHSI in 1967.