The Microscope: and Its Revelations |
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Page 72
... color , and it will be surrounded by a pris- matic fringe in which blue , green , yellow , orange , and red may be successively distinguished . If , on the other hand , the screen be placed at D , the focus of the red rays , the image ...
... color , and it will be surrounded by a pris- matic fringe in which blue , green , yellow , orange , and red may be successively distinguished . If , on the other hand , the screen be placed at D , the focus of the red rays , the image ...
Page 73
... colors , whilst its marginal portion shall exhibit broad fringes.2 12. The Chromatic Aberration of a lens , like the Spherical , may be diminished by the contraction of its aperture , so that only its central portion is employed . But ...
... colors , whilst its marginal portion shall exhibit broad fringes.2 12. The Chromatic Aberration of a lens , like the Spherical , may be diminished by the contraction of its aperture , so that only its central portion is employed . But ...
Page 74
... color as a convex lens of crown - glass , whose focal length is 4 inches . Hence a concave lens of the former ... colors . The double correction may be accomplished theoretically by the combination of three lenses , namely , a double ...
... color as a convex lens of crown - glass , whose focal length is 4 inches . Hence a concave lens of the former ... colors . The double correction may be accomplished theoretically by the combination of three lenses , namely , a double ...
Page 83
... by just the difference in the place of these images , their rays , after refraction by it , enter the eye in a parallel direction , and produce a picture free from false color . If the CONSTRUCTION OF COMPOUND MICROSCOPE . 83.
... by just the difference in the place of these images , their rays , after refraction by it , enter the eye in a parallel direction , and produce a picture free from false color . If the CONSTRUCTION OF COMPOUND MICROSCOPE . 83.
Page 84
William Benjamin Carpenter Francis Gurney Smith. produce a picture free from false color . If the object - glass had been rendered perfectly achromatic , the blue rays , after passing through the field - glass , would have been brought ...
William Benjamin Carpenter Francis Gurney Smith. produce a picture free from false color . If the object - glass had been rendered perfectly achromatic , the blue rays , after passing through the field - glass , would have been brought ...
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Common terms and phrases
acetic acid achromatic acid adjustment afford angle angular aperture animal Animalcules antheridia aperture appearance archegonia arrangement attached body calcareous Canada balsam cavity cells centre cilia color condenser consists containing convex convex lens corpuscles Crustacea cuticle diameter disk distance distinct Ditto Ehrenberg employed endochrome epithelium examination extra cloth extremely eye-piece fibres filaments fluid focus Foraminifera frustules furnished illumination inch Insects instrument Journal kind lacunæ larvæ layer lens lenses light magnifying power matter Medical membrane ment Microscopist milled head minute mode mounted movement nearly object-glass oblique observed octavo octavo volume ordinary organs particles peculiar plants plate portion present prism Prof rays refraction rendered resembling Rotifera scale seen segments separated shell side slide sometimes species specimens spicules stage stem stomata structure substance surface thickness thin glass tion tissue transparent transverse tube usually utricle Vegetable vessels Volvox whilst Zoophytes zoospores
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