The Microscope: An Introduction to Microscopic Methods and to HistologyGutenberg Press, 1899 - 237 pages |
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Abbe camera lucida achromatic acid alcohol Amer Amici prism angle angular aperture apochromatic appear balsam bands Bausch & Lomb camera lucida Canada balsam catalog cell cement collodion color compound microscope concave condenser cover cover-glass croscope crystals dark dehydration determined diaphragm distance drawing board drawing surface edge equivalent focus eye-lens eye-point field focusing screen Fraunhofer lines glycerin histology homogeneous immersion illumination imbedding immersion objectives jective Jour lamp lens paper lenses lines liquid Lomb Optical magnification measured medium method Micr micro micro-spectroscope micrometry microscopic objects millimeters minutes mirror mount dry mounting necessary numerical aperture obtained ocular micrometer optic axis ordinary paraffin photo-micrographs photographic placed plane plate position preparation prism Proc projection ocular real image refraction removed satisfactory screw sections seen shellac simple microscope sine slide slit solution specimen spectrum stage micrometer stain thickness tion tissue tube tube-length vertical virtual image xylene Zeiss
Popular passages
Page 51 - ... the ratio of the sines of the angles of incidence and refraction | sln ' I it will be seen that whenever the sine of the angle of refraction is \sin r) increased, by being in a less refractive medium, the index of refraction will show a corresponding decrease and vice versa.
Page 38 - DETERMINATION OF WORKING DISTANCE § 78. Working distance, no cover. — As stated in § 77, this is the distance between the front lens or mounting of the front lens of the objective and the object when the objective is in focus. It is always less than the equivalent focal length of the objective. Make a wooden wedge 10 cm. long which shall be exceedingly thin at one end and about 20 mm. thick at the other. Place a slide on the stage and some dust or an ink or pencil mark on the slide. Do not use...
Page 181 - ... added. The first effect is the production of the yellow or cinnamon-coloured compound of iodine and quinine, which forms as a small circular spot; the alcohol separates in little drops, which, by a sort of repulsive movement, drive the fluid away; after a time, the acid liquid again flows over the spot, and the polarising crystals of sulphate of iodo-quinine are slowly produced in beautiful rosettes. This succeeds best without the aid of heat.
Page 221 - Illustrated Encyclopaedic Medical Dictionary : Being a Dictionary of the Technical Terms used by Writers on Medicine and the Collateral Sciences in the Latin, English, French, and German Languages.
Page 210 - Nebulous doubling with oblique illumination indicates overcorrection of the marginal zone, want of the edges without marked nebulosity indicates undercorrection of this zone; an alteration of the adjustment for oblique and central illumination, that is, a difference of plane between the image in the peripheral and central portions of the objective points to an absence of concurrent action of the separate zones, which may be due to either an average under or overcorrection or to irregularity in the...
Page 3 - ... they will cross this axis. They do not all cross at one point, but if the faces are near together, and are very small parts of spherical surfaces, as in our lenses, such rays will cross at or near a certain point, f, on the principal axis, and this point is called the principal focus of the lens. There are two principal foci, one on each side of the lens. See points F and F
Page 40 - Observations. (203.) 1. The eye should be protected from all extraneous light, and should not receive any of the light which proceeds from the illuminating centre, excepting what is transmitted through or reflected from the object. 2. Delicate observations should not be made when the fluid which lubricates the cornea is in a viscid state. 3. The best position for microscopical observations is when the observer is lying horizontally on his back.
Page 183 - In following these processes, I have found, that the images of small objects, produced by means of the solar microscope, may be copied without difficulty on prepared paper. This will probably be a useful application of the method ; that it may be employed successfully however, it is necessary that the paper be placed at but a small distance from the lens.
Page 53 - Select any dark speck or opaque portion of the object, and bring the outline into perfect focus; then lay the finger on the milled-head of the fine motion, and move it briskly backwards and forwards in both directions from the first position. Observe the expansion of the dark outline of the object, both when within and when without the focus. If the greater expansion, or coma, is when the object is without the focus, or farthest from the Objective, the lenses must be placed farther asunder, or towards...
Page 171 - ... power of interpretation, increase. They thus form the basis of further or more correct knowledge ; but in order to be safe guides for the student, teacher, or investigator, it seems to the writer that every preparation should possess, two things : viz. , a label and a catalog or history. This catalog should indicate all that is known of a specimen at the time of its preparation, and all of the processes by which it is treated. It is only by the possession of such a complete knowledge of the entire...