. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. 34 LIGHTING AND FOCUSING. [CH. II. high objectives, it would be necessary to use very thin cover-glasses over the ob- ject. (See \ 22, 27). If too thick covers are used, it may be impossible to get an objective near enough an object to get it in focus. For objects that admit of ex- amination with high powers it is always better to use thin covers. RIGHTING WITH DAYLIGHT. \ 58. Unmodified sunlight should not be employed except in special cases. North light is best and most uniform. When the sky is cove
. The microscope; an introduction to microscopic methods and to histology. Microscopes; 1899. 34 LIGHTING AND FOCUSING. [CH. II. high objectives, it would be necessary to use very thin cover-glasses over the ob- ject. (See \ 22, 27). If too thick covers are used, it may be impossible to get an objective near enough an object to get it in focus. For objects that admit of ex- amination with high powers it is always better to use thin covers. RIGHTING WITH DAYLIGHT. \ 58. Unmodified sunlight should not be employed except in special cases. North light is best and most uniform. When the sky is covered with white clouds the light is most favorable. To avoid the shadows produced by the hands in manipulating the mirror, etc., it is better to face the light ; but to protect the eyes and to shade the stage of the microscope some kind of screen should be used. The one figured in (Fig. 58) is cheap and efficient. If one dislikes to face the window or lamp it is better to sit so that the light will come from the left as in reading. It is of the greatest importance and advantage for one who is to use the micro- scope for serious work that he should comprehend and appreciate thoroughly the various methods of illumination, and the special appearances due to different kinds of illumination. Depending on whether the light illuminating an object traverses the object or is reflected upon it, and also whether the object is symmetrically lighted, or lighted more on one side than the other, light used in microscopy is designated as re- flected and transmitted, axial and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. Ithaca, N. Y. , Comstock Publishing Company
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