An Elementary Text-book of the Microscope: Including a Description of the Methods of Preparing and Mounting Objects, Etc

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John Von Voorst, 1864 - Microscope and microscopy - 192 pages
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Page 181 - ... and if the crystal be still further turned, the images begin to come together again until, when it has turned through another right angle, they coincide. This process of separation, or doubling the rays, is called double refraction. And the following experiment will show that one set of rays follows the ordinary law of refraction, while the other follows a different law. The image produced by the first set of rays is, in consequence, called the ordinary, and that produced by the second the extraordinary...
Page i - An Elementary Text-book of the Microscope ; including a description of the Methods of preparing and mounting Objects etc.
Page 171 - ... meniscus, in which one surface is convex and the other concave. The curved surfaces of lenses are usually portions of spheres.
Page 145 - ... has narrow linear leaves, with a blade or expanded surface, which are either scattered over the branches, as in the fir, or come out in fasciculi or bundles, as in the larch and cedar; the cypress form has the needle leaves reduced to the condition of scales, which are closely imbricated or lie on each other like the tiles on the roof of a house. The needle-leaved forest is generally found on mountains where high winds prevail, as this form of foliage presents a less amount of resisting surface...
Page 167 - The consideration of the merits of these two theories would be foreign to our purpose : suffice it to say that the evidence in favour of the undnlatory theory preponderates, to that the corpuscular theory is now laid aside.

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