Bausch & Lomb Optical Company Projection Eyepieces Our projection eyepieces are of achro- matic construction and project an image superior in every way to those given by ordinary eyepieces. We recommend for >her powers. use with the 16 mm objective and all Reflecting Prism Attachable Mechanical… … being dependent upon the size of the microscope stage. The scales of both move- ments are graduated in single millimeters with verniers reading to tenths. The main parts are lacquered black to avoid reflections. The scales are engraved on fine German silver. 114
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-240-94.webp)
