The Microscope and Histology: For the Use of Laboraory Students in the Anatomical Department of Cornell UniversityAndrus & Church, 1891 - Broj stranica: 180 |
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The Microscope and Histology: For the Use of Laboraory Students in the ... Simon Henry Gage Pregled nije dostupan - 2017 |
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Stranica 23 - 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...
Stranica 87 - 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.
Stranica 85 - ... 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.
Stranica 77 - 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 history of a preparation that one is...
Stranica 7 - Abbe to indicate the capacity of an optical instrument "for receiving rays from the object and transmitting them to the image, and the aperture of a microscopic objective is therefore determined by the ratio between its focal length and the diameter of the emergent pencil at the point of its emergence, that is the utilized diameter of a single-lens objective or of the back lens of a compound objective.
Stranica 7 - To appreciate that, in using the term "aperture," we use it not in any artificial sense, but as meaning opening and nothing else, — defining, simply, the capacity of an objective for receiving rays from the object and transmitting them to the image. (2) That the aperture (as so defined) of an objective is determined by the ratio between the diameter of the emergent beam and the focal length of the objective. According as this ratio is greater or less, so the objective will receive and transmit...