biolab 1

• Base - stand that supports the microscope.
• Pillar - a short piece of metal that attaches to one end of the base; also supports the microscope.
• Handle/Arm - curved metallic part arising from the pillar used for holding the microscope.
• Inclination Screw - found at the junction of the pillar and the handle used for tilting the microscope. This is no longer included in the design of current microscopes.
• Body Tube - cylindrical structure vertically arising from the handle; holds the dust shield and nosepiece.
• Ocular Tube or Draw tube - upper smaller end of the body tube bearing the eyepiece or ocular lens.
• Revolving Nosepiece - circular structure where the objectives are attached that permits the shifting of objectives
• Dust Shield - circular structure above the nosepiece that protects the lenses of the objectives.
• Adjustment Screws - two pairs of wheels attached to either side of the body tube.
• Coarse Adjustment Screw - for adjusting the focus of the scanner and low power objective
• Fine Adjustment Screw - for delicate focusing of the high power and oil immersion objectives
• Stage - A square or round platform with an opening at the center where the slide is placed.
• Mirror Rack - found below the stage and attached to the pillar; holds the mirror in place
• Ocular or Eyepiece - found on the draw tube through which the operator peeps during actual focusing; usually carries magnification of 10X.
• Pointer - A thin, black line that appears to cut halfway across the field of view which the student or instructor can use to point out regions of the specimen under observation
• Objectives - tube-like structures attached to the revolving nosepiece.
• Scanner - Red / carries a magnification of 4x
• Low Power Objective (LPO) - Yellow / carries a magnification of 10x
• High Power Objective (HPO) - Blue / carries a magnification of 40x.
• Oil Immersion Objective - White / carries a magnification of 100x; requires the use of cedar oil.
• Mirror - found below the stage near the base used to collect and direct light to the specimen
• Diaphragm - found below the stage used to regulate the entry of light onto the specimen. There are different types of diaphragm: iris, plate or fan.
• Condenser - Lens found immediately beneath the hole of the stage used to concentrate light rays on the specimen.
• Magnification - may be defined as the number of times the image of an object is enlarged by the magnifying lens or the number of times a drawing is enlarged or reduced from the original size of the object.
• Total Magnification = Magnification of eyepiece x Magnification of objective