ClipArt ETC
An adjustment screw diagram used to raise or lower microscope slightly. The series of screw and springs are used to move the microscope, B.

Leitz Micrometer Adjustment Screw for Microscope

An adjustment screw diagram used to raise or lower microscope slightly. The series of screw and springs…

"The long lever D is pressed to one side by the screw F, and is thus turned round the in E. On the tube very near to pin E is cylinder C, which by the action of the screw F is very slightly raised or lowered." —Encyclopaedia Britannica, 1910

Swift and Son Micrometer Adjustment Lever for Microscope

"The long lever D is pressed to one side by the screw F, and is thus turned round the in E. On the tube…