pressure screw (preshurskro)

In ordnance, a screw used to hold parts in position by pre ure. It is the analogue of the set-screw in general mechanism. See set -screw. One of nu pre ure-spot (presh'ur-spot), n . merous minute spots or areas on the surface of the body, in which it appears from experi- mentation that the proper sensations of pres- sure reside, this sensation not being excitable in the intervening spaces. The finest point, when it touches a pre ure - spot , pro- duces a sensation of pre ure, and not one of being pricked. G. T. Ladd, Physiol. Psychology, p. 410. pre work (pres'werk), n. 1. The working or management of a printing-pre ; also, any other 2. In mech.: ( a ) An equilibrated force. Experience showed that the pre ures of vault cannot be concentrated upon any single point, but only upon a line which extends over a considerable portion of the pier from the springing point upwards. blower, which produces a blast by centrifugal action. In min sion on a pre : in opposition to composition, or that branch of printing which is confined to preparing types for the pre .-2. In joinery, cabinet-work of a number of succe ive veneers cro ing grain, and united by glue, heat, and pre ure. E. II. Knight. (b) A force per unit area exerted over the surface of a body or part of a body, and toward the interior of the body. A force exerted upon a surface is nece arily equilibrated; otherwise, since the surface has no na , it would produce infinite velocity until equilib rium ensued. A pre ure can produce no motion, because it is a state of equilibrium; but a continuous variation of pre ure in a given direction will tend to produce motion toward the places of le pre ure. Thus, if a cylinder of liquid in a tube is under greater pre ure per square inch at one end than at the other, there will be a tendency to motion toward the end where the pre ure is le . (c) Stre in general, being either thrust, pull, or shearing stre . For axis of pre ure, conjugate pre ure, and other phrases where pre ure means stre , see the latter word. Boyle discovered a law about the dependence of the pre ure of a gas upon its volume, which showed that if you squeeze a gas into a smaller place it will pre so much the more as the space has been diminished. W. K. Clifford, Lectures, I. 180. Uniform pre ure ,. such as the atmospheric, and, in a le degree, that of our bodily parts and of our clothes, produces no distinct consciousne . J. Sully , Sensation and Intuition, p. 60. pre ure-figure (presh'ūr-figūr), п. eral., a figure produced in a section of some minerals by the pre ure of a rather sharp point: thus, upon a sheet of mica the pre ure figure has the form of a six-rayed star, which is diagonal in position to the more easily obtained percu ion-figure-that is, its rays are normal to edges of the prism and clinopinacoid. pre ure-filter (presh'ūr-filter), n. A filter in See yeast . prest1 (prest). An occasional preterit and past participle of pre 1. prest2+ (prest), v. t. [OF. prester, F. préter, lend, ascribe, attribute, give rise to, afford, = Pr. Sp. Pg. prestar = It. prest are, which the liquid to be filtered is forced through charge. filtering material by pre ure greater than that of its own weight in the filter. Positive increase of the difference between the pre ure on the liquid surface and against the discharge outlet is effected either by forcing air into an inclosed space over the liquid, by increas ing the head through use of a standpipe, or by decreasing the atmospheric pre ure upon the discharge outlet. A pre ure-forging (presh'ür-for"jing), п. method of shaping metal in dies in a forging pre by means of great pre ure, usually hydraulic; hydraulic forging. pre ure-gage (presh'ūr-gāj), n. 1. An apparatus or attachment for indicating the pre ure of steam in a boiler.-2. In gun., an instrument used to determine the pre ure of powder-gas per square unit of area in the bore or chamber of a gun. The gas acts upon one end of a Cf. rest2.] To furnish; pay out; put out as a loan; lend. To have prested and lent money to Kynge Henry for the arrayenge and settynge forth of a new arm ye against hym. Hall , Edw. IV., an. 10. "I myself have prested ," wrote the Earl to Burghley, "above 3000l. among our men here since I came, and yet what need they be in... all the world doth see." Motley, Hist. Netherlands, I. 523. prest2 (prest), n . [ prest , F. prét (= Pr. prest = It. presto ), a loan, prester , lend: see prest2 , v .] 1. A loan of money; hence, a loan in general; also, ready money. The sum me of expenses, as well of wages & prests as for the expenses of the kings houses. Hakluyt's Voyages , I. 121. prest 2. Formerly, a duty in money paid by the sheriff on his account in the exchequer, or for money left or remaining in his hands. Cowell. -To give in prestt, to give as prest-money; hence, to pay, give, or lend (money) in advance. He sent thyder three somers [baggage-horses] laden wt nobles of Castel and floreyns, to gyue in prest to knyghtes and squyers, for he knewe well otherwyse he sholde not haue them come out of theyr houses. Berners , tr. of Froi art's Chron., II. lxiv. prest3+ (prest), a . [ prest , prest , prest , F. prét = Pr. prest = Sp. Pg. It. presto , ready, præstus , ready, præsto , adv., at hand, ready, present, here, præ , before, + stare , stand. Cf. prest2 .] 1. Ready; prompt; quick. He is the prestest payer that pore men knoweth. Piers Plowman (B), v. 558. I am prest to fette hym when yow liste. Chaucer, Troilus, iii. 917. Cursed Dionyza hath The pregnant instrument of wrath Prest for this blow. Shak., Pericles, iv., Prol., 1. 45. Well, well, I'll meet ye anon, then tell you more, boys; However, stand prepar'd, prest for our journey. Fletcher, Wild goose Chase, v. 2. 2. At hand; near. Set me vvhereas the sunne doth parch the greene, Or vvhere his beames do not di olue the yce: In temperate heate vvhere he is felt and seene, In presence prest of people mad or vvise. Putten ham , Arte of Eng. Poesie, p. 186. Berdys ther sange on bowhes prest . Robin Hood and the Potter (Child's Ballads, V. 29). 3. Bold; valiant. 4710 prestidigitation (pres-ti-dij-i-tā'shon), n. [F. prestidigitation, an altered form (as if 'dexterous fingering,' prestidigitator (pres-ti-dij'i-tā-tor), n. [ The sophisms of infidelity and the prestiges of imposture. War burton , Works, IX. v. 2. An illusion as to one's personal merit or importance, particularly a flattering illusion; hence, a reputation for excellence, importance, or authority; weight or influence arising from reputation. Mr. Quincy had the moral firmne which enabled him to decline a duel without any lo of personal prestige. Lowell, Study Windows, p. 106. Unle a man can get the prestige and income of a Don, and write donnish books, it's hardly worth while for him to make a Greek and Latin machine of himself. Pausanias King none prester IMG:content-0913.png:[blocks in formation] tus, pp. of præstigiare, deceive by juggling tricks, The wisest way, when all is said, is with all humility and feare to take Christ as himselfe hath revealed himselfe in his Gospel, and not as the Devill presents him to prestigiated phansies. N. Ward , Simple Cobler, p. 18. prestigiation (pres-tij-i-āʻshon), n . [F. * pres tigiation (later prestidigitation : see prestidigi tation ), præstigiare , pp. præstigiatus , deceive by juggling tricks: see prestigiate .] The playing of legerdemain tricks; a trick of legerdemain; juggling; sleight of hand. [Rare.] What a multitude of examples are there in good authentic authors of divers kinds of fascinations, incantations,