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Birds with short, broad, rounded wings, with the under surface slightly concave and the upper surface correspondingly convex, usually have comparatively heavy bodies, and race through the air with rapid wing-beats and rather labored flight, and compass only short distances. Among the birds of this kind of aërial movement may be mentioned the American meadowlark, the bob-white, and the pheasant.
As to noses, I say nothing of them, though we had every variety: some snubbed and turned up, with distended nostrils, like a dormer window on the roof of a house; others convex and twisted like a buck-handled knife; and others magnificently eforescent, like a full-blown cauliflower.
Here a vast vault was introduced, the colonnade disappeared, the architrave was rounded into an arch from column to column, the capitals of these were changed from concave to convex, and a thousand other changes in structure and ornament introduced flexibility and variety.
But lower down in the glacier proper, where it is completely transformed into ice, its surface becomes convex, for the following reason: The rocky walls of the valley, as they approach the plain, partake of its higher temperature. They become heated by the sun during the day in summer, so that the margins of the glacier melt rapidly in contact with them.
The form is slightly oval, the longest diameter being one and six-tenths inch, the shortest one and four-tenths inch. The thickness is not uniform, but greater on one side than on the other. The plane surface is ill-polished and scratched, the convex one, not polished on a concave spherical disk, but fashioned on a lapidary's wheel, or by some method equally rude.
The convex part was covered round about with a very delicate skin or membrane which was transparent. The convex part, which was a type of the brain in least forms, was also divided into two beds, as it were, just as the brain in its larger form is divided into hemispheres.
The slightly convex base is the cutting edge. A piece of skin is often placed between the metal and the lashings; this facilitates the removal of the blade, and enables the craftsman to alter the angle between the cutting edge and the haft.
There his lines stretched in convex front along undulating ground near Wachau and Liebertwolkwitz, about a league to the south and south-east of the town.
It is the momentum which sustains it in space, not the air pressure beneath the wings, for reasons which we have heretofore explained. Flights of sufficient duration have thus been made to prove that convex, as well as concave surfaces are efficient; nevertheless, in its proper place we have given an exposition of the reasoning which led to the adoption of the concaved supporting surfaces.
Let us suppose that this convex scale is pulled out of shape from the interior, so that it is slightly flattened and as quickly released; it will immediately regain its original convexity owing to the elasticity of the nervures. From this oscillation a ticking sound will result. Twenty years ago all Paris was buying a silly toy, called, I think, the cricket or cri-cri.
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