but unless properly constructedis very hable to become unsteady, and is often in theway, preventing a candle, &c. fiom approaching closebehind the stage; the disadvantage of the other method is,that the observer is usually compelled to use both handsin this adjustment. The plan contrived by Mr.… … The end C, which is cylindrical, fits into the stage ofthe microscope, or the lower immoveable plate A maybe the stage. This plate A is fixed to the part C; it hasa circular aperture in the middle, and a small hole at o,which acts as the centre of motion for the plate B to turnabout; on the top of…
Microscopy
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![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher05nati-277-179.webp)
