25’ with the is 134, in. A narrow paper collar is glued around one holes in the stage and hand piece. The polarizing plate may consist of a plate of polished black glass, but it is generally more convenient to employ an ordinary piece of glass blackened on one side. A thin pine wedge cemented to… … AND ment, and preserved for future use. It is sometimes desirable to rotate the end of the tube, and both the hand piece and the stage polarizer. When the black glass plate is used, this is A recent scientific investigation of the matter shows are counterbored to receive the collar, as shown in the…
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