NELSON 1a MICROSCOPE

MAKER:Charles Baker Company

MODEL:'Nelson-Curties No 1a' or 'Nelson-Curties No 1A'

c.1900

UNSIGNED CONDENSER HOUSING

An unsigned condenser housing with two turn-out filter or insert holders, the top one for holding the monochromatic glass filter(see below) and the bottom one with a knurled ring providing rotation, and accepting any of the included (22 mm) dark ground stops or oblique lighting inserts. It also has a working iris diaphragm which makes a total of three areas under the optics to modify the illumination. It has an RMS thread and so accepts two optical parts that fit this including one signed '1/4 inch' in lacquered brass and another in nickel finish by R. & J Beck Ltd , London, labeled 7mm and N.A. 1.0.