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Updated: June 20, 2025
The asbestos with which the chimney is lined should be about 1/8 in. thick, and, when renewing, the same thickness should be used as originally. A thicker board will reduce the annular space round the tube, and will have a choking effect on the flame much the same as referred to above, when there is too much gas and not enough air.
Planetary and annular nebulæ are, without exception, gaseous, as well as those termed "irregular," which frequent the region of the Milky Way. Their constitution usually betrays itself to the eye by their blue or greenish colour; while those yielding a continuous spectrum are of a dull white.
On the other hand, we have the atoll; a thing of problematic origin and history, the reputed creature of an insect apparently unidentified; rudely annular in shape; enclosing a lagoon; rarely extending beyond a quarter of a mile at its chief width; often rising at its highest point to less than the stature of a man man himself, the rat and the land crab, its chief inhabitants; not more variously supplied with plants; and offering to the eye, even when perfect, only a ring of glittering beach and verdant foliage, enclosing and enclosed by the blue sea.
The blubber is placed in an annular vessel, A. The oil from it passes through a pipe, B, and spreads out on the surface of a plate, C, with a containing flange; d d are raised points which serve as heat conductors; e e is a tin chimney for flame with air holes at its base.
It adds a last touch of horror to the thought of this precarious annular gangway in the sea, that even what there is of it is not of honest rock, but organic, part alive, part putrescent; even the clean sea and the bright fish about it poisoned, the most stubborn boulder burrowed in by worms, the lightest dust venomous as an apothecary's drugs.
Subcutaneous rupture of the tendon of the extensor pollicis longus at the wrist takes place just after its emergence from beneath the annular ligament; the actual rupture may occur painlessly, more frequently a sharp pain is felt over the back of the wrist. The prominence of the tendon, which normally forms the ulnar border of the snuff-box, disappears.
I have myself picked up in that desert, within the space of a very few square yards, fragments apparently of fossil palms, and of at least two petrified trees distinctly marked as of exogenous growth both by annular structure and by knots.
The earliest forms of brooches were the annular, that is, a long pin with a hinged ring at its head for ornament, and the "penannular," or pin with a broken circle at its head. Through the opening in the circle the pin returns, and then with a twist of the ring, it is held more firmly in the material. Of these two forms are notable examples in the Arbutus brooch and the celebrated Tara brooch.
One can then understand that the bubbles of this central eruption have kept their first form. Crystallized by cooling, they have stereotyped that aspect which the moon formerly presented when under the Plutonian forces. The distance which separated the travelers from the annular summits of Tycho was not so great but that they could catch the principal details.
The upper part is ornamented with horizontal lines of annular indentations, and the body is covered with rather rude patterns made by rolling a notched wheel or roulette back and forth in zigzag lines. Two handsome pieces of this ware were recently obtained by the Bureau of Ethnology from a mound in Vernon County, Wisconsin.
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