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The second year included rowlock and bonded segmental arches; blocking, toothing, and corbeling; building and bonding of vaulted walls; polygonal and circular walls, piers and chimneys; fire-places and flues.
There are many bodies, vegetable, mineral, and congealed salts, which are formed with certain regular angles and figures. Thus among flowers there are many which have their leaves disposed in ordered polygons, to the number of 3, 4, 5, or 6 sides, but not more. This well deserves to be investigated, both as to the polygonal figure, and as to why it does not exceed the number 6.
In order to state clearly the argument based upon these works it is necessary to present a brief explanation. There are several forms and varieties of stone graves or cists found in the mound area, some being of cobble stones, others of slabs; some round, others polygonal; some dome-shaped, others square, and others box shaped, or parallelograms.
At Aix-la-Chapelle a polygonal church exists, built by Charlemagne, and which tradition asserts was designed on the model of San Vitale at Ravenna. The resemblance is undoubted, but the German church is by no means an exact copy of Justinian's building. Piers are used more frequently than columns in the interiors, and are often very plain.
Towers were common, occasionally detached, but more frequently joined to the main building. Circular and polygonal buildings for use as baptisteries, and sometimes as churches, existed both in the basilican and the Romanesque time.
When near the morning terminator, the region on the N. is seen to be traversed by some very remarkable ridges and markings; one cutting across the N. wall appears to represent a "fault." On the S. is a large polygonal enclosure formed by low ridges. On the W., towards Timocharis, is a brilliant mountain 3000 feet high, a beautiful little object under a low sun.
The annexed engravings illustrate a method of constructing subaqueous foundations by the use of iron pile planks. Polygonal or curved perimeters may be circumscribed with equal facility by joining the piles, the sides of one serving as a guide to that of its neighbor, and special pieces being adapted to the angles.
The mean result of repeated trials, all differing but slightly, show that the energy of the direct solar rays acting on the polygonal reflector is reduced 0.235 before reaching the heater.
At one of the corners of this building there is a small turret, of stone, its form is polygonal; its ornaments are rich and in very good taste: it is a fine specimen of the productions of the renaissance.
There is a long bone, termed 'metatarsal', answering to the metacarpal, for each digit; and the 'tarsus', which corresponds with the carpus, presents four short polygonal bones in a row, which correspond very closely with the four carpal bones of the second row of the hand. In other respects the foot differs very widely from the hand.
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