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Updated: May 4, 2025
They are convex on one side, flat on the other, and are marked by five yellowish ribs. Though a French writer says the seed degenerates "promptly," and recommends the use of fresh seed annually, it will not be wise to throw away any where it is not wanted to germinate, unless it is over four years old, as seed as old even as that is said to be satisfactory for planting. Cultivation.
The convex lens of the eye-piece was carried not by a tube properly so called, but by four rigid fine wires placed at right angles. This arrangement left the focus open in almost every direction. A concave mirror was then placed so that it threw a very condensed image of the sun laterally on the very spot where the image of the advertisement was formed.
Nothing can be more singular than the appearance at low tide of this "flat" of naked stone, especially where it is externally bounded by the smooth convex mound of Nulliporae, appearing like a breakwater built to resist the waves, which are constantly throwing over it sheets of foaming water. The characteristic appearance of this "flat" is shown in the foregoing woodcut of Whitsunday atoll.
There's a pleasant sense of swelling fullness about the river; it may be an optical delusion, but I am inclined to believe it is a fact that the surface is slightly convex, like an old-fashioned mirror, perhaps an inch or two higher in the middle than at the sides. There is not much depth to spare, already we have touched bottom.
Furthermore, with the coming of dawn it had evinced a disposition to moderate its violence somewhat, while the sky had cleared for a few brief minutes in the eastern quarter, revealing a glimpse of the sun; and upon examining the barometer, Leslie had noticed that the mercury in the tube showed a convex surface a sign that it was about to rise; he therefore suffered himself to indulge the hope that with improving weather, they would ere nightfall be enabled, by good steady hard work, to get the brig into such shape as to once more have her under command.
It had been discovered, among other things, that in oblique refraction light is separated into colors. Therefore, any small portion of the convex lens of the telescope, being a prism, the rays proceed to the focus, separated into prismatic colors, which make the image thus formed edged with a fringe of color and indistinct.
Just as a concavity will fit into a convexity, for the very reason that it is concave and not convex, so the human unlikenesses, which are correspondent to God, are the characteristics by which it becomes possible that we should cleave to Him and inhere in Him.
For to eat or to drink amid such romantic surroundings, even if it were unstrained milk, was an experience not to be despised. Yet here are two cities situated like amphitheatres upon the convex curve of two ideally beautiful harbors. How do you compare them? Each according to your own temper and humor. You have seen hundreds of colored photographs both of Naples and Constantinople.
M. Lipmann explained the action by showing that the electro-motive force which is generated tends to alter the convexity of the surface of the mercury. The surface of the mercury, looked at from one side, has a convex form, which is altered by the electro-motive force set up when connection is made with the battery.
Nearly every one interested in the subject is aware that this object-glass is composed of two lenses a concave one of flint-glass and a convex one of crown-glass, the latter being on the side towards the object. This is the one vital part of the telescope, the construction of which involves the greatest difficulty.
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