This 'Selenite Stage' provides a deep well which rotates via a pinion controlled by a knurled knob. The three supplied selenites can be dropped into the cell either individually and can be oriented in several different directions from each other, in combinations to impart different effects. This device reveals a wide variation in colors of polarized objects-a very entertaining accessory. The selenites have the effect of changing the coloration of objects seen under crossed polarizers. The degree of the effect varies with the type of object being studied, and different colors are imparted by different selenites. In use by the author, this device seems to offer a wider variety of variations than the Watson 'Mica-Selenite Stage'. Another unsigned example on this site, likely made earlier, is thicker and has both lacquered brass selenite rings, and unframed selenites encased in glass. The selenites for these accessories usually came in a small unsigned lacquered brass can, but the other example on this site has a fancy engraving on the can and is labeled 'Selenites, 3'.