Beale, Lionel S. (Lionel Smith), 1828-1906 · London, Harrison · leaf 60
madeto slide on a horizontal bar which turns on a pivot, so that theposition for reflected light is easily secured (Plate XIII, Pig. 40).A mirror is employed by daytime, and slides in the same groove,or upon the same rod, as the lamp. The mirror, achromatic condenser, polariscope, and… … Fig. .31.-
Microscopy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-752-322.webp)
