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The Duke's burning-glass was the instrument used to apply heat to the diamond. It consists of two double convex lenses, distant from each other about 3½ feet; the large lens is about 14 or 15 inches in diameter, the smaller one about 3 inches in diameter. By means of the second lens the focus is very much reduced, and the heat, when the sun shines brightly, rendered very intense.
There were eight faces in all, some of them composed of emerald, amethyst, or turquoise. But one face the one that turned at a direct angle towards the wearer's eye was not a gem at all, but an extremely tiny convex mirror. In a moment I spotted the trick.
On witnessing thus much of the work performed, I was struck with three points: first, the rapidity with which the insect worked; secondly, the tenacity with which she kept her original position whilst excavating; and thirdly, her constantly going over work which had apparently been completed.... The lid is excavated and rendered concave on its outer or upper surface, and is convex and rough on its inner surface; and, in fact, is a simple repetition of the first-formed portion of the cell, a part of a hollow sphere."
The Professor was standing in the doorway peering short-sightedly through his convex glasses, his head protruded from his loosely-fitting great-coat with an irresistible suggestion of an inquiring tortoise.
For the two wings did not come into action at the same time as the center: but the center was first engaged because the Gauls, having been stationed on the arc of the crescent, had come into contact with the enemy long before the wings, the convex of the crescent being toward the enemy.
It is denticulated: it encloses the whole of the latter and inferior part of the chest as far as the sternum, where it is connected with the ensiform cartilage. The diaphragm is the main agent, both in ordinary and extraordinary respiration. In its quiescent state it presents its convex surface towards the thorax, and its concave one towards the abdomen.
The gleam from the waters came up the pass; the grand castle crowned the left-hand steep, seeming to warm its old bones, like the ruins of some awful megatherium in the lighted air; one white sail sped like a glad thought across the spandrel of the sea; the shadows of the rocks lay over our path, like transient, cool, benignant deaths, through which we had to pass again and again to yet higher glory beyond; and one lark was somewhere in whose little breast the whole world was reflected as in the convex mirror of a dewdrop, where it swelled so that he could not hold it, but let it out again through his throat, metamorphosed into music, which he poured forth over all as the libation on the outspread altar of worship.
Sachs himself admits that "if the growth which takes place in the entire tendril at the time of contact with a support is small, a considerable acceleration occurs on the convex surface, but in general there is no elongation on the concave surface, or there may even be a contraction; in the case of a tendril of Cucurbita this contraction amounted to nearly one-third of the original length."
Fine hairs arise from the front edge and side of the plate, and similar hairs are scattered over the body and especially around the end. On the upper side of each segment is a transversely oblong ovate roughened area, with the front edge slightly convex, and the hinder slightly arcuate.
There are formed successive layers relatively friable in texture, each of which, thickest at the most exposed parts, and being presently lost by weathering, leaves the contained mass in a shape more rounded than before; until, resting on its convex under-surface, it is easily moved.
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