Manipulation Of The Microscope

Paperback | January 31, 2012

byEdward Bausch

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897. Excerpt: ... Mirror and Mirror-Bar.--The proper illumination of an object is an important feature and although there are numerous accessories for properly accomplishing this, which will be spoken of later on, the mirrors alone are effective agents when properly constructed and applied, particularly when no high magnification is used. The plane mirror is generally used with very low powers and reflects light in about its original intensity. The concave mirror, however, is intended to concentrate the light so that all the rays which strike its surface are reflected and come together at some point above and the rays from the surface being contained within a comparatively small space, cause an increased intensity. This point is called the focal point and is usually arranged to coincide with the opening of the stage, when parallel rays such as from the sky are used. When the source of light comes considerably nearer to the mirror, as for instance from a lamp and the rays are diverging, the focal distance becomes considerably longer. Some of the intensity is lost in consequence, as well as the degree of convergence. For this reason some mirror-bars are so arranged that the distance of the mirror from the stage may be varied to accommodate the variation in the location of the source of light. While this is of considerable aid, there is in some instruments not sufficient room for a complete accommodation, with the result that, under certain conditions, the utmost effectiveness of the microscope is not obtained. Diaphragm.--This is provided for regulating the amount of light. While the mirror should work to its utmost capacity, it very often occurs that for certain investigations a profuseness of light is more harmful than otherwise. When too much light exists, objects are sai...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897. Excerpt: ... Mirror and Mirror-Bar.--The proper illumination of an object is an important feature and although there are numerous accessori...

Format:PaperbackDimensions:38 pages, 9.69 × 7.44 × 0.08 inPublished:January 31, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217506534

ISBN - 13:9780217506533

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