Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario
Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario
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In our eReader you can find the full English version of the book. Read Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario
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The field of these lenses cannot be lighted throughout its whole ex- MICROSCOPICAL PRAXIS. 73 tent by either mirror. The concave gives only a cen- tral bright spot while the plane surface does little better. To light this large region fully, the plane mirror should be covered with a disk of white card-board, and parallel rays thrown on it by the bull's-eye condensing lens. The mirror and the card are then manipulated as the mirror alone should be. Or a more successful result may perhaps be atta...ined by taking the light with the mirror from the brightly illuminated inner surface of a white lamp-shade. With the two-inch or the one-inch the plane mirror alone is sufficient. All higher powers demand the use of the concave surface, unless the bull's- eye lens is placed between the lamp and the mirror, with a sub-stage condenser between the mirror and the object; or unless some form of microscopical lamp is used with a permanent bull's-eye lens, in which cases the plane surface should be turned toward the con- denser.
What to read after Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario?
You can find similar books in the "Read Also" column, or choose other free books by Alfred C Alfred Cheatham Stokes to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The field of these lenses cannot be lighted throughout its whole ex- MICROSCOPICAL PRAXIS. 73 tent by either mirror. The concave gives only a cen- tral bright spot while the plane surface does little better. To light this large region fully, the plane mirror should be covered with a disk of white card-board, and parallel rays thrown on it by the bull's-eye condensing lens. The mirror and the card are then manipulated as the mirror alone should be. Or a more successful result may perhaps be atta...ined by taking the light with the mirror from the brightly illuminated inner surface of a white lamp-shade. With the two-inch or the one-inch the plane mirror alone is sufficient. All higher powers demand the use of the concave surface, unless the bull's- eye lens is placed between the lamp and the mirror, with a sub-stage condenser between the mirror and the object; or unless some form of microscopical lamp is used with a permanent bull's-eye lens, in which cases the plane surface should be turned toward the con- denser.
What to read after Microscopical Praxis Or Simple Methods of Ascertaining the Properties of Vario?
You can find similar books in the "Read Also" column, or choose other free books by Alfred C Alfred Cheatham Stokes to read onlineMoreLess
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