Tobacco And Its Adulterations
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To illustrate this, let x (Fig. 18) be a ray of light, reflected from the mirror of the microscope, passing through the centre of the air-bubble, phg; let z be other rays passing near its periphery, and c d ef a, glass slide on the stage of the instru- ment, containing water. The rays z, impinging obliquely on the tangential plane of g are in consequence of passing from a denser medium (water) to a rarer medium (air), refracted from the perpendicular gv to g h. At A these rays are again re- fra...cted, but now, towards the perpendicular v h ; consequently, in the direction h i. On reaching the point i they are again refracted from the perpendicular, so that they never reach the object-glass a b, nor, consequently, the eye. The central rays, X, and those nearly central, y, pass through the perpendicular axis of the air-bubble unaffected ; therefore the margin of the air-bubble, as it transmits no rays, will appear dark, and its centre, as it transmits them, will be illuminated.
To these unavoidable obstructions to the successful use of the microscope, to which the best observer is liable, must be added such false appearances as are due to want of dexterity in obtaining specimens of tissues fit for examination, or in badly or carelessly THE MICROSCOPE.
What to read after Tobacco And Its Adulterations?
You can find similar books in the "Read Also" column, or choose other free books by Henry Paul Prescott to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
To illustrate this, let x (Fig. 18) be a ray of light, reflected from the mirror of the microscope, passing through the centre of the air-bubble, phg; let z be other rays passing near its periphery, and c d ef a, glass slide on the stage of the instru- ment, containing water. The rays z, impinging obliquely on the tangential plane of g are in consequence of passing from a denser medium (water) to a rarer medium (air), refracted from the perpendicular gv to g h. At A these rays are again re- fra...cted, but now, towards the perpendicular v h ; consequently, in the direction h i. On reaching the point i they are again refracted from the perpendicular, so that they never reach the object-glass a b, nor, consequently, the eye. The central rays, X, and those nearly central, y, pass through the perpendicular axis of the air-bubble unaffected ; therefore the margin of the air-bubble, as it transmits no rays, will appear dark, and its centre, as it transmits them, will be illuminated.
To these unavoidable obstructions to the successful use of the microscope, to which the best observer is liable, must be added such false appearances as are due to want of dexterity in obtaining specimens of tissues fit for examination, or in badly or carelessly THE MICROSCOPE.
What to read after Tobacco And Its Adulterations?
You can find similar books in the "Read Also" column, or choose other free books by Henry Paul Prescott to read onlineMoreLess
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