Bausch & Lomb introduced this basic monocular model in the early 1900s as their Stand A system, which was subsequently redesigned in 1908. The model featured below was redrawn from a photograph of the original microscope, which is part of the Billings microscope collection at Walter Reed Army Hospital in Washington DC.

The horseshoe base and curved limb are constructed with cast iron for stability and strength. Both the body and draw tubes are brass with a rack and pinion coarse focus adjustment, and the microscope mounts a single objective. Originally, the stage was rectangular and made with polished cast iron, but the modified glass stage has a specialized mechanical movement and is five inches in diameter. On the stage are 20 specimen mounts. Rotation of the stage is accomplished by means of a knob attached to the top of the glass plate. An unusual rod mechanism is fastened (presumably to steady the stage) between the stage and a second glass plate extending from the body tube.

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