A London Encyclopaedia, Or Universal Dictionary of Science, Art, Literature and Practical Mechanics: Comprising a Popular View of the Present State of Knowledge : Illustrated by Numerous Engravings, a General Atlas, and Appropriate Diagrams, Volume 6Thomas Curtis Thomas Tegg, 1829 - Aeronautics |
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Page 340
... directrix . III . The point S is called the focus . IV . The given ratio of SP to PE , is called the determining ratio . V. If a line SD be drawn through the focus , perpendicular to the directrix , which is produced indefinitely , it ...
... directrix . III . The point S is called the focus . IV . The given ratio of SP to PE , is called the determining ratio . V. If a line SD be drawn through the focus , perpendicular to the directrix , which is produced indefinitely , it ...
Page 340
... directrix , which have the same proper- ties as the former . Take CHCS , and Cd CD ; through d draw x de perpendicular to Cd , meeting PQ , pq , in e and r , and join HQ . Then if the whole figure , nQ Mqr , be turned round upon the ...
... directrix , which have the same proper- ties as the former . Take CHCS , and Cd CD ; through d draw x de perpendicular to Cd , meeting PQ , pq , in e and r , and join HQ . Then if the whole figure , nQ Mqr , be turned round upon the ...
Page 340
... directrix of the hyperbola in the points H , h , and lines be drawn from the centre through the points of intersection , these lines are called the asymptotes . PROP . XIII . Fig . 11 . If lines SH , Sh , drawn from the focus S to the ...
... directrix of the hyperbola in the points H , h , and lines be drawn from the centre through the points of intersection , these lines are called the asymptotes . PROP . XIII . Fig . 11 . If lines SH , Sh , drawn from the focus S to the ...
Page 340
... direc- trix . Let PH which touches the parabola at P meet the directrix in H. Join SP , SH , and draw PE perpendicular to the directrix . The angle SPE is bisected by PH . For SP PE and PH is common to the triangles PSH , EPH ; and PSH ...
... direc- trix . Let PH which touches the parabola at P meet the directrix in H. Join SP , SH , and draw PE perpendicular to the directrix . The angle SPE is bisected by PH . For SP PE and PH is common to the triangles PSH , EPH ; and PSH ...
Page 343
... directrix in a given angle , cut a parabola in the points Q , p , and P , the rectangle under QL , and the latus rectum will be to the rectangle PLLp in a constant ratio . - Draw LX perpendicular to the directrix ; and from the centre L ...
... directrix in a given angle , cut a parabola in the points Q , p , and P , the rectangle under QL , and the latus rectum will be to the rectangle PLLp in a constant ratio . - Draw LX perpendicular to the directrix ; and from the centre L ...
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acid Æneid ancient angle appears axis Bacon beautiful body Browne's Vulgar Errours burning called Canterbury Tales carriage centre Chaucer chenoo church cloth coal coast cock cold color combustion common conic section considerable consists contains copper degree diameter directrix Ditto Dryden Ducat earth east ellipse equal Faerie Queene feet fire fixed flame France hath heat Henry Henry VIII Hudibras hydrogen hyperbola inches inhabitants iron island Ital Julius Cæsar kind king latus rectum means ment metal miles mixture n. s. Lat nature Opticks Paradise Lost person phlogiston piece pillars plants plate produced Prop quantity river Rixdollar round screw Scudo Shakspeare side signifies species Specific gravity Spenser strata stratum substance surface temperature things thou tion town weight wheel whole word
Popular passages
Page 274 - Are not the mountains, waves, and skies, a part Of me and of my soul, as I of them?
Page 21 - AH ! who can tell how hard it is to climb The steep where Fame's proud temple shines afar; Ah! who can tell how many a soul sublime Has felt the influence of malignant star, And waged with Fortune an eternal war; Check'd by the scoff of Pride, by Envy's frown, And Poverty's unconquerable bar, In life's low vale remote has pined alone, Then dropt into the grave, unpitied and unknown...
Page 322 - Reading maketh a full man, conference a ready man, and writing an exact man. And therefore if a man write little he had need have a great memory: if he confer little he had need have a present wit, and if he read little he had need have much cunning to seem to know that he doth not. Histories make men wise, poets witty, the mathematics subtle, natural philosophy deep, moral grave, logic and rhetoric able to contend,
Page 363 - Is there, in human form, that bears a heart — A wretch ! a villain ! lost to love and truth ! That can, with studied, sly, ensnaring art, Betray sweet Jenny's unsuspecting youth? Curse on his perjur'd arts ! dissembling smooth ! Are honour, virtue, conscience, all exil'd?
Page 422 - But hark ! a rap comes gently to the door ; Jenny, wha kens the meaning o' the same, Tells how a neebor lad cam' o'er the moor, To do some errands, and convoy her hame. The wily mother sees the conscious flame Sparkle in Jenny's e'e, and flush her cheek ; With heart-struck anxious care, inquires his name, While Jenny hafflins is afraid to speak : Weel pleased the mother hears it's nae wild, worthless rake. Wi...
Page 415 - Brethren, if any of you do err from the truth, and one convert him, let him know, that he *which converteth the sinner from the error of his way, shall save a soul from death, and shall hide a multitude of sins.
Page 400 - OH for a lodge in some vast wilderness, Some boundless contiguity of shade, Where rumour of oppression and deceit, Of unsuccessful or successful war, Might never reach me more.
Page 415 - To sit on rocks, to muse o'er flood and fell, To slowly trace the forest's shady scene, Where things that own not man's dominion dwell, And mortal foot hath ne'er, or rarely, been ; To climb the trackless mountain all unseen, With the wild flock that never needs a fold ; Alone o'er steeps and foaming falls to lean ; This is not solitude ; 'tis but to hold Converse with Nature's charms, and view her stores unroll'd.
Page 326 - Their blood is shed In confirmation of the noblest claim — Our claim to feed upon immortal truth, To walk with God, to be divinely free, To soar, and to anticipate the skies.
Page 282 - Yet when I approach Her loveliness, so absolute she seems And in herself complete, so well to know Her own, that what she wills to do or say, Seems wisest, virtuousest, discreetest, best.