Microscope 19 Terms from yhr PPT

Base – Heavy

Y-shaped foot on which the microscope stands.

Draw tube – Upper portion of the body tube which bears the eyepiece.

Body tube – Attached to the arm and bears the lenses.

Arm – Supports the tube and connects it to the base.

Pillar – Short supporting piece arising from the base.

Inclination joint – Joint between the pillar and the arm used to tilt the upper parts.

Revolving nosepiece – Revolving structure at the lower end of the body tube which bears the lower lenses.

Dust shield – Metallic structure above the nosepiece which protects the lower lenses.

Coarse adjustment knob – Knob geared to the body tube

used to bring the object into focus.

Fine adjustment knob – Knob below the coarse adjustment knob

used for more delicate focusing.

Stage – Platform with a central aperture and two clips to hold the slide being studied.

Mechanical stage – Mechanism attached to the stage for ease in moving the slide.

Eyepiece / Ocular – The lens at the top that you look through

usually 10x or 15x power.

Mirror – Found below the stage with concave and flat surfaces to gather and direct light to illuminate the object.

Iris diaphragm – Found above the mirror; several metal blades form a circular opening that may be enlarged or reduced to control the amount of light.

Condenser – Found immediately beneath the stage; further concentrates the light rays on the specimen.

Low power objective lens – Shorter lens screwed to the rotating nosepiece; forms the image of the object within the body tube. Magnifying power is 10x.

High power objective lens – Longer lens screwed to the rotating nosepiece; forms a bigger image of the object within the body tube. Magnifying power is 40x.

Oil immersion objective lens – Provides the most powerful magnification

100x.