At this time there is on my papers an infinity of optical investigations: also a plan of an eye-piece with a concave lens to destroy certain aberrations.

Nearer still the gray changed to purple; lowlands rose out of the sea, sloping upwards with those grand and simple concave curves which betoken, almost always, volcanic land.

3700 feet aloft a pyramid of black lava rises above the broken walls of an older crater, and is, to judge from its knife-edge, flat top, and concave eastern side, the last remnant of an inner cone which has been washed, or more probably blasted, away.

Lowness N. lowness &c adj.; debasement, depression, prostration &c (horizontal) 213; depression &c (concave)

V. be concave &c adj.; retire, cave in. render concave &c adj.; depress, hollow; scoop, scoop out; gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.

V. be concave &c adj.; retire, cave in. render concave &c adj.; depress, hollow; scoop, scoop out; gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.

Adj. depressed &c v.; alveolate^, calathiform^, cup-shaped, dishing; favaginous^, faveolate^, favose^; scyphiform^, scyphose^; concave, hollow, stove in; retiring; retreating; cavernous; porous &c (with holes) 260; infundibul^, infundibular^, infundibuliform^; funnel shaped, bell shaped; campaniform^, capsular; vaulted, arched.

periscopic lens^; telescope, glass, lorgnette; spyglass, opera glass, binocular, binoculars, field glass; burning glass, convex lens, concave lens, convexo-concave lens^, coated lens, multiple lens, compound lens, lens system, telephoto lens, wide-angle lens, fish-eye lens, zoom lens; optical bench.

periscopic lens^; telescope, glass, lorgnette; spyglass, opera glass, binocular, binoculars, field glass; burning glass, convex lens, concave lens, convexo-concave lens^, coated lens, multiple lens, compound lens, lens system, telephoto lens, wide-angle lens, fish-eye lens, zoom lens; optical bench.

So a great intellect sinks to the level of an ordinary one, as soon as it is interrupted and disturbed, its attention distracted and drawn off from the matter in hand; for its superiority depends upon its power of concentrationof bringing all its strength to bear upon one theme, in the same way as a concave mirror collects into one point all the rays of light that strike upon it.

The gall placed in the concave of the liver, extracts choler to it: the spleen, melancholy; which is situate on the left side, over against the liver, a spongy matter, that draws this black choler to it by a secret virtue, and feeds upon it, conveying the rest to the bottom of the stomach, to stir up appetite, or else to the guts as an excrement.

The skull is widely different from that of his brother the Hill tiger, being low in the crown, wider in the jaws, rather flat in comparison, and the brain-pan longer with a sloping curve at the end, the crest of the brain-pan being a concave curve.

From the black trumpet's rusty concave broke Sulphureous flames, and clouds of rolling smoke; The pois'nous vapour blots the purple skies, And withers all before it as it flies.

The concave roof of the tribune itself was decorated with a colossal Christ, enthroned between S. Peter and S. Paul, surveying the vast spaces of his house: the lord and master, before whom pilgrims from all parts of Europe came to pay tribute and to perform acts of homage.

The south front, towards Pimlico, will form the general entrance to the palace, a concave circular Ionic colonnade and lodges.

It consists of a thin concave of copper, fixed by three wires, at about an inch above the chimney-glass of the lamp, yet capable of being taken off at pleasure.

The gaseous carbonaceous matter which occasionally escapes from the top of lamps, is thus arrested beneath the concave cap, and subsequently consumed by the heat of the flame, instead of passing off into the room, in the form of smoke or smut on the ceiling and walls.

In this operation a narrow plow lightly opened the crests of the beds; cotton seed were drilled somewhat thickly therein; and a shallow covering of earth was given by means of a concave board on a plow stock, or by a harrow, a roller or a small shallow plow.

Their Petticoats, which began to heave and swell before you left us, are now blown up into a most enormous Concave, and rise every Day more and more: In short, Sir, since our Women know themselves to be out of the Eye of the SPECTATOR, they will be kept within no Compass.

Shell orbicular conical; spire rather depressed; whorls five spirally striated; upper part flattened, expanded, white with numerous diverging red cross lines; centre flat, nearly at right angles with the upper edge, white, with a convex thread-like rib round its base, which is distantly articulated; base of the whorls convex, red, punctured and variegated with white; axis conical, concave, white, smooth at the commencement;

It is entirely smooth, polished, and has the last whorl near the spire slightly concave, edged with a scarcely raised rather nodulous line, the outer lip is very thick, grooved on its inner edge, and the columella is distinctly plaited.

Profile oval, with a somewhat convex nape, and the face descending in a very slightly concave line.

There are no scales between the cranial ridges on the top of the head, nor in the concave inter-orbital space.

Head ovate, depressed, covered with small rather acute scales, with 2 small frontal plates just over the rostral in front; rostral small, triangular, concave in the centre.

Behind him the cliff rose upwards, in front and, to his right, and left a concave wall, straight down to the beach.

The coach company now consisted of nine passengers inside, one on the top, (which, from its convex form, is a very precarious situation,) and three on the box, besides the coachman, who sat on the knees of the unfortunate middle man,an uneasy burden, considering the intense heat of the weather.

At last he himself constructed an instrument,a leaden organ pipe with two spectacle glasses, both plain on one side, while one of them had its opposite side convex, and the other its second side concave.

The reflector was cleaned, but in vain; at last it was discovered that one of the lenses (the convex lens) of the combination which forms the object-glass of a Reversed Telescope in the interior of the Transit-axis, and through which all illuminating light must pass, had become so corroded as to be almost opaque.

The sea, instead of being a plane, was slightly convex, and the sky, instead of resting upon it at the horizon, curved down beyond it, as the upper side of a horn curves over the lower, when one looks into the mouth.

The following is sung: Horizontal, perpendicular, Horizontal, perpendicular, Parallel, parallel, Parallel, lines, Diverging, converging, diverging lines, Diverging, converging, diverging lines. Spreading wider, or expansion, Drawing nearer, or contraction, Falling, rising, Slanting, crossing, Convex, concave, curved lines, Convex, concave, curved lines.

The brittle horn, convex sole, and other changes we have described under Pumiced Foot may, however, be regarded as a chronic laminitis, and this condition, as we have already indicated in Chapter VI., may run a course slow and insidious from the onset.

This, as we have already pointed out, is due to descent of the os pedis, and the highest point of the convex portion is that immediately in front of the apex of the frog.

The broad web and deep seating gives ample protection to the convex sole, and with the ease in distributing his weight that this shoe affords the animal is able to perform slow work on soft lands with some degree of comfort.

To do this a double sage-knife is run flatwise between the coronary cushion and the cartilage, with the convex surface of the blade towards the skin.

The first story, 95 feet in height, consists of twenty-four faces in the form of convex flutings, alternately semicircular and rectangular, built of alternate courses of marble and red sandstone.

In striking contrast with it is a vulgar, fantastic temple covered inside and out with convex mirrors.

The convex lensas since developed into the microscope, the giver of a new world to manwas known to Archimedes only as an instrument to burn the enemy's fleet.

At a warning of this kind I did not then feel disposed to take alarm; but there were other warnings not to be slightedthe horizon to the east presented the extraordinary appearance of a black cloud in the shape of a bow, with its convex towards the sea, and which kept its singular shape and position unchanged until nightfall.

The machine is fitted with convex glasses, in the upper part, to serve the purpose of windows; and Mr. Mackintosh states, that on several occasions, in clear weather, he has witnessed the sun's rays so concentrated by the circular windows, as to burn the labourers' clothes, when opposed to the focal point, and this when the machine was twenty-five feet under the surface of the water!From the MS.

Above five gross per day are ground of convex and concave glasses in one shop.

A concentric convex basin is then covered with round pieces of plate glass fixed with pitch; and the convex stir face, with its glass pieces, is then turned and wabbled in the concave basin by steam power.

A concentric convex basin is then covered with round pieces of plate glass fixed with pitch; and the convex stir face, with its glass pieces, is then turned and wabbled in the concave basin by steam power.

From the disproportionately small, convex, thin-quilled, wing,so thin, that a vacant space, half as broad as a quill appears between each,the flight may be said to be a sort of fluttering more than any thing else: the bird giving two or three claps of the wings in quick succession, at the same time hurriedly rising; then shooting or floating, swinging from side to side, gradually falling, and thus producing a clapping, whirring sound.

The bill is thick and strong: the ridge is advanced to a remarkable extent towards the front, and divides the thickset feathers which cover the nostrils by a convex ridge of three quarters of an inch long.

Later the English Press, anxious, naturally enough, to throw into high relief the exploits of our own troops in France, and getting only scraps of news from the French lines, gave a distorted view of the general situation, and threw the whole picture of the war out of perspective, like the image of a man in a convex mirror.

From the sandy bottom was struggling forth a convex shield that, when floating, showed its lower face smooth and yellow.

C is a frame for holding the negative, on the opposite side of which is a double convex lens facing the light.

Plano-convex bricks and the methods of their employment

On the other hand, by pulling down the tassel, the plate will be raised and drawn upward against the board, so as to present its convex surface, with the words STUDY HOURS upon it, distinctly to the school.

"This was formerly in common use," says Mr. Lucas; "a round iron pan, about ten inches deep and eighteen inches across, with a tight-fitting, convex lid.