How To Set Up the Microscope Instrument

How To Set Up the Microscope Instrument.

How To Set Up the Microscope Instrument

Draw the instrument from the case by grasping the base, and free it from dust. If it has draw tube, bring it to its standard length, which is indicated by a ring, by as little of a screw motion as possible ; if the draw tube is highly polished, its surface will be best retained by observing the above precaution. See that the mirror and largest aperture of the diaphragm are in a central position in the optical axis. After being convinced that the eye pieces are clean, place one into the tube ; then remove the objectives from their cases and after first having increased the distance between the stage and tube by means of the milled heads of the pinion, attach the lowest power to the nose-piece, by using both hands, being careful that it is as near as possible in the optical axis while screwing it on. Then incline the body by placing the left hand upon the base and drawing with the right hand upon the arm ; be careful not to pull on the tube, as it may prove too heavy a strain upon this or the fittings. Incline the body of the microscope until the eye piece about reaches the level of the eye, so that when an observation is made the position is as comfortable as possible ; the neck should not be strained, neither should the chest be compressed. Next place the slide with a transparent object upon the stage, by sliding it under the spring dips and get it as near as possible in the center of the opening ; for an object anything near at hand, such as a piece of printed paper or cotton fibres will do. Watching the slide, adjust the mirror until it is seen that the light strikes the object ; incline the head to the level of the stage, and observing the objective, rack it down to within i inch of the object. Again placing the eye at the eyepiece, reverse the motion of the milled heads and observing the field continue the upward motion of the body until the image of the object appears in view.

---