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Bausch & Lomb KA Greenough-Style Binocular Stereomicroscope

The Bausch & Lomb Binocular Microscope K consists of the twin body tubes and eyepieces of the company's KA Greenough-style microscope mounted on a simple horseshoe stand. Each body tube is fitted with an achromatic objective, a Huygenian eyepiece, and a Porro prism. Unlike more modern binocular microscope designs based on beamsplitters, these 1929 Greenough microscopes produce erect, three-dimensional images that are, however, inverted by 180 degrees.

The K microscope provides an excellent platform for examining specimens that are too large to place on a stage, but can be satisfactorily viewed under incident light. Entomologists preferred the K model for examining museum specimens, but it also performs well for inspecting wood, metal, leather, and paper, including large sections that were not suitable for most microscope configurations. An optional wide stage offers even more latitude in applications (than the standard 80 x 95 millimeter stage) with its broad, rectangular aperture and two removable plates.

The adjustable arm of the Bausch & Lomb binocular microscope K allows, with relative ease, the increase or decrease of the distance between the objective and the base. Model K-1 is equipped with a pair of matched 10x Huygenian eyepieces and a matched pair of 3.8x achromatic objectives. The K-3 model also features 6.4x eyepieces and substitutes matched pairs of 2.6x and 5.6x objectives for the single pair of the K-1. Most versatile in the K line of binocular microscopes, the Bausch & Lomb K-5, is equipped with three pairs of matched Huygenian eyepieces (5x, 7.5x, and 10x) and three pairs of matched achromats (2.0x, 3.8x, and 8.4x). One objective in each 24-millimeter (8.4x) or 32-millimeter (5.6x) lens pair is fitted with a compensating collar for independent focusing. To facilitate centering and optimize modularity, each matched set of paired objectives is mounted in a substantial, one-piece sliding base, engraved with the serial number of the microscope stand.

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