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Eyepiece : Used to see objects under study.
Arm        : Supports the Tube and Connects the base
Stage Clip : Holds the Slide
Base : Provides Basal Support
Power Switch : Main power switch, turns illumination on or off
Diaphragm : Controls amount of light that passes. 
Knob (Fine Adjustment) : Focuses on oil. High powered lens.
Knob (Coarse Adjustment) : Focus on scanning. Low powered lens.
Tube : Connects eyepiece to objective lenses
Resolving nosepiece : Allows the rotation of lenses while viewing
Objective Lenses.