The microscope and some hints on how to use it / E. Leitz.

  • Ernst Leitz (Firm)
Date:
[1910]
Catalogue details

Licence: In copyright

Credit: The microscope and some hints on how to use it / E. Leitz. Source: Wellcome Collection.

    13/54 page 7
    Short Description of the Microscope. As will be seen from Fig. 1, a microscope consists of the following parts: A. Mechanical. 1. The Body with its Draw-tube. The latter has a millimetre scale which shows the total length of the working tube reckoned from the shoulder of the objective screw to the eyelens of the eyepiece. The latter fits the top of the tube, whilst the lower end is provided with a screw thread for the attachment of an objective, revolving nosepiece or other screw adapter. 2. The Limb, especially in the moi'e recent models, forms a con- venient handle. It carries the coarse and fine focussing adjust- ments, of which the former is actuated by a rack and pinion, whilst the latter is of the nature of a micrometer screw. 3. The Object Stage, which in many stands is so arranged that it may be rotated and centred. It has an opening at the centre which admits light from the illuminating apparatus to the object. 4. The Pillar with a hinge for inclining the instrument. 5. The Foot, which is either of the horseshoe or of the English tripod pattern. B. Optical. 1. The Illuminating Apparatus, consisting of a plane and con- cave mirror, a stop usually in the form of an iris-diaphragm, which in the larger stands is attached to a separate swing-out diaphragm carrier fitted with a rack and pinion for placing the diaphragm in an eccentric position, and finally a condenser. 2. The Objectives. These are either of the “dry” series, or they are immersion lenses. 3. The Eyepieces. There are two kinds, viz. Huyghenian and Compensating Eyepieces. Path of Rays. Before proceeding to describe the various parts of the micro- scope and to explain their respective functions it will be well to trace out the course of the rays as they pass from the mirror through the optical system, which will convey a general notion of the optical principle of the microscope. i
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