"Concavity" Quotes from Famous Books
 ... with the "face mark" on the shooting board whilst the edges are shot, because any inequality would be multiplied by the number of pieces jointed. A better method is to alternate the boards, face side up, then face side down, whilst shooting the edges; this will prevent convexity or concavity on the face of the jointed board, because any slight error in the angle is neutralised ...
— Woodwork Joints - How they are Set Out, How Made and Where Used. • William Fairham
... are parallel, the reflected rays converge to a focus, but when the incident rays proceed from a focus, or are divergent, they are reflected parallel. It is only when an object is nearer to a concave mirror than its centre of concavity, that its image is magnified; for when the object is farther from the mirror, this centre will appear less than the object, and ...
— The History and Practice of the Art of Photography • Henry H. Snelling
... so many little doors, open and shut the four openings which are in these two concavities; to wit, three at the entry of the vena cava, where they are so disposed, that they can no wayes hinder the bloud which it contains from running into the right concavity of the heart; and yet altogether hinder it from coming out. Three at the entry of the arterious vein; which being disposed quite contrary, permit only the bloud which is in that concavity to pass to the lungs; but not that which is in the lungs to return thither. And then two others at ...
— A Discourse of a Method for the Well Guiding of Reason - and the Discovery of Truth in the Sciences • Rene Descartes
... be used the bands will dispose themselves in a fanlike arrangement, their divergence depending upon the distance of the slit from the centre of concavity. ...
— Six Lectures on Light - Delivered In The United States In 1872-1873 • John Tyndall
... best columns, those of standards for example, no concavity is seen, at any time: but it is otherwise with many barometers, ...
— Barometer and Weather Guide • Robert Fitzroy
... cave at all. Up the winding ascent the fugitives sped, until opposite a lip or shelf, which projected from the rocks on their left. It extended forward three or four feet, rudely sloping away like the forepiece of a cap, but the concavity below was less than half that depth. Jack expected to find a retreat ten or fifteen feet deep. As it was, there was barely room to screen themselves from the flying bullets, and had the rain been driven from the opposite direction when Otto first sought refuge there ...
— Footprints in the Forest • Edward Sylvester Ellis
... devices are employed in the construction of reflecting telescopes to avoid the loss of light which would result—a loss which would be important even with the largest mirrors yet constructed. Thus, in Gregory's Telescope, a small mirror, having its concavity towards the great one, is placed in the axis of the tube and forms an image which is viewed through an aperture in the middle of the great mirror. A similar plan is adopted in Cassegrain's Telescope, a small convex mirror replacing the concave one. In Newton's ...
— Half-hours with the Telescope - Being a Popular Guide to the Use of the Telescope as a - Means of Amusement and Instruction. • Richard A. Proctor
... the island looked no larger than insects. The huzzaing and shouting were little by little lost in the distance, and only the discharge of the ship's guns could be heard in the concavity beneath the balloon, as the latter ...
— Five Weeks in a Balloon • Jules Verne
... e and i the sound of s; as sincerely, centrick, century, circular, cistern, city, siccity: before a, o, and u, it sounds like k, as calm, concavity, copper, ...
— A Grammar of the English Tongue • Samuel Johnson
... but we managed to flounder through it, until at length we got on the somewhat firmer but still heavy plain. It was very clear, however, that our horses would not go a day's journey over such ground. It looked exactly as I have described it—an immense concavity, with numerous small channels running down from every part, and making for the creek as a centre of union; nor, could we anywhere see a termination to it. Had the plain been of less extent, I might have doubted the information of the natives; but, looking at the boundless hollow around me, ...
— Expedition into Central Australia • Charles Sturt
... S. Sporangium pileate, very much depressed, convex above and concave below, stipitate; the wall a dark-colored membrane, thickly covered with minute white crystals of lime, except the brown concavity underneath, the upper part breaking away, the lower persistent. Stipe short, erect, rugulose, brown or blackish, expanding at the base into a small hypothallus; the columella reduced to a thin layer of minute brown scales upon the base of the sporangium. Capillitium of simple ...
— The Myxomycetes of the Miami Valley, Ohio • A. P. Morgan
... eventually cup-like. These changes of shape are expressive of great changes of structure, as may be seen in the last of the series (v), where the shallow cup is seen in partial section. The electric plate lines the concavity of the cup, and is richly supplied with nerves (only a few of which are represented in the last drawing); the thick walls of the cup are composed of muscular fibres, the striation of ...
— Darwin, and After Darwin (Vol. 1 and 3, of 3) • George John Romanes
... glass to be ground, and are, say, half an inch thick. These discs are turned convex or concave on one face according as they are to be employed in the production of concave or convex glass surfaces. The proper degree of convexity or concavity may be approximated to by turning with ordinary turning tools, using a circular arc cut from zinc or glass (as will be described) as a "template" or pattern. This also is a mere matter ...
— On Laboratory Arts • Richard Threlfall
... (Ellis); downwards and backwards (Harrison), in front of the sacro-iliac synchondrosis, as far as the upper extremity of the great sacro-sciatic notch, a distance varying in the adult from one and a half to two inches in length. It forms a curve with its concavity forwards, and at its termination divides into, rather than gives off, its two or three principal branches. Its corresponding vein is in close contact behind, as also the lumbo-sacral nerve, the obdurator nerve to its outer side. The peritoneum ...
— A Manual of the Operations of Surgery - For the Use of Senior Students, House Surgeons, and Junior Practitioners • Joseph Bell
... color, but occasionally reddish; and sometimes oozing of blood is noticed. A most common picture in tuberculosis is a broadening of the carina, which may be so marked as to obliterate the carina and to bulge inward, producing deformed lumina in both bronchi. Sometimes the lumina are crescentic, the concavity of the crescent being internal, that is, toward the median line. Absence of the normal anterior and downward movement of the carina on deep inspiration is almost pathognomonic of a mass at the bifurcation, ...
— Bronchoscopy and Esophagoscopy - A Manual of Peroral Endoscopy and Laryngeal Surgery • Chevalier Jackson
... stars, golden-rain, serpents, and Catharine wheels are the principal noted. "Fierie dragons combatant" running on lines, and filled with fireworks, were the greatest stretch of invention at this time; and our author says they may be made "to meete one another, having lights placed in the concavity of their bodies, which will give ...
— Curiosities of Literature, Vol. II (of 3) - Edited, With Memoir And Notes, By His Son, The Earl Of Beaconsfield • Isaac D'Israeli
... went over several Tracts of rich Land, but mix'd with Pines and other indifferent Soil. In our way, there stood a great Stone about the Size of a large Oven, and hollow; this the Indians took great Notice of, putting some Tobacco into the Concavity, and spitting after it. I ask'd them the Reason of their so doing, but they made me no Answer. In the Evening, we pass'd over a pleasant Rivulet, with a fine gravelly Bottom, having come over such another that Morning. On the other side of this River, ...
— A New Voyage to Carolina • John Lawson
... excessive downward movement of the contents of the horny box, but it at the same time removes the one great means by which concussion of the foot is destroyed. As adjuncts to the foregoing errors must be added the faults of construction in the shoe and in the way it is adjusted to the foot. An excess of concavity in the shoe, extending it too far back on the heels, high calks, thin heels which permit the shoe to spring, short heels with a calk set under the foot, and a shoe too light for the animal wearing it or for the work required of him, ...
— Special Report on Diseases of the Horse • United States Department of Agriculture
... no element of fire, which must be held with this opinion here delivered; for if wee suppose a world in the Moone, then it will follow, that the spheare of fire, either is not there where 'tis usually placed in the concavity of his Orbe, or else that there is no such thing at all, which is most probable, since there are not any such solid Orbs, that by their swift motion might heare and enkindle the adjoyning aire, which is imagined to be the reason of that element. ...
— The Discovery of a World in the Moone • John Wilkins |
