|American Microscope Makers|
This stage is a revival of an idea which Mr. Bulloch says was used by Spencer thirty years ago. It consists of the ordinary stage-plate, having in its centre a large square hole. One side of this plate con- tains a wide dovetailed groove, in which slides a bar with its surface level with the top of the plate. At right angles to this bar is attached another bar. On this second bar slides a third bar, into which it has been dovetailed. The motion of this third bar is at right angles to the motion of the first. A thin plate is attached to the third bar, and lies flat upon the stage-plate. This plate is perforated, and holds the slide by means of a spring. It will be seen that this arrangement permits of motion of the thin plate in two directions at right angles to one another. Two pinions, perpendicular to the stage, control this motion; they work one through the other, and act upon racks placed at right angles. Scales placed at right angles serve as finders.
The substage is similar in design to that of Messrs. Sidle, and a screw has been added to the base for clamping the base-plate which rotates on the tripod.
|Walter H. Bulloch||other microscope makers|
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