Early Low Power Objective with Built-in Prism for Vertical Illumination
MAKER: Unsigned
19th C.
DESCRIPTION:
This is a very fine low power objective with a built in prism for vertical illumination of opaque objects. Light directed from the side enters the prism and is reflected down on the subject being studied and the reflected light travels back up through the objective to the eyepiece.
Objectives with integrated prisms like this are rare. Robert Tolles was known to make higher power objectives with built-in prisms starting about 1881. This example is unsigned and the maker is unknown.
