A Familiar Introduction to the Theory and Practice of Perspective |
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A Familiar Introduction to the Theory and Practice of Perspective Joseph Priestley Fragmentweergave - 1770 |
A Familiar Introduction to the Theory and Practice of Perspective Joseph Priestley Fragmentweergave - 1970 |
A Familiar Introduction to the Theory and Practice of Perspective Joseph Priestley Fragmentweergave - 1970 |
Veelvoorkomende woorden en zinsdelen
alſo angle appearance becauſe body called caſe circle common conſequently contained declination deſcribed determined direction diſtance divide diviſions draw the line elevation equal evident example extremity fall fame figure firſt fixed give given given line ground line height horizontal line idea inſtrument interſecting joining juſt knowledge laid length leſs line drawn manner marked meet method moſt muſt myſelf nature objects oblique obſerved occaſion original parallel perpendicular perſon perſpective plane picture piece point of diſtance point of fight poſition practice produced proportion purpoſe raiſed rays reaſon repreſent reſpect right angles right line ruler rules ſame ſector ſeen ſet ſhadow ſhall ſhould ſide ſince ſituation ſome ſquare ſtand ſufficient ſuppoſed taken tangent theory theſe thing thoſe tion triangles true uſeful vaniſhing line vaniſhing point whole
Populaire passages
Pagina 59 - I, in the next place, take its elevation above the horizon, and, fuppofing it to be 20 degrees, I make ab equal to aE, and the angle abx equal to 20 degrees, which finds x the point required. In this method may the fituation of any other point be found, and thefe points, being joined by lines, the whole object will be delineated. But if the objects to be reprefented contain many right lines, that are parallel to one another, fuch as occur in buildings, machines, &c. there will be no occafion to take...
Pagina 61 - If I would introduce meafures into a drawing made in this manner, or find a fcale for the picture ; I meafure fome one line in the original, as kf. In order to this, from c, the...
Pagina 39 - All the meafures of lines upon the ground plane are to be laid down upon the ground line, and the meafuring point of all lines parallel to the ground line, is either of the points of diftance on the horizontal line, or the point of fight. The meafuring point of any line, perpendicular to the ground line, is in the point of diftance, on the horizontal line; and the meafuring point of a line oblique to the ground line, is found by extending the...
Pagina 59 - ... right, I fet off the angle DEa equal to 10 degrees, and conclude, that the point I want to fix muft be fomewhere in the perpendicular ae. To find in what part of this line the point is, I, in the next place, take its elevation above the horizon, and, fuppofing it to be 20 degrees, I make ab equal to aE, and the angle abx equal to 20 degrees, which finds x the point required. In this method may the fituation of any other point be found, and thefe points, being joined by lines, the whole object...
Pagina 60 - I confider that c, the vanifliing point of yx, makes the angle DEc equal to 20 degrees, the complement of which, from 90, is 70. I, therefore, make the angle DEH equal to 70 degrees, and a line EH produced till it meets the horizontal...
Pagina 61 - ... and of every other line parallel to it which is at right angles with the line xy. To this point, therefore, we draw the line yz, and all the others in that plane that are parallel to it. The point x, is to the right hand of the perpendicular, and it has an elevation above the horizon ; but it can require no additional instruction, to be able from this, to fix any point to the left hand of the perpendicular, and one that has a depression below the horizon. If we would introduce...
Pagina 110 - G being situated at the height of the eye from the ground line AB, and G D being equal to the distance of the eye from the perspective plane ; the line DC may be imagined to be the perspective plane seen edgeways ; and then any point q, situated at a given distance beyond it, must appear at m, in a straight line drawn from the eye at G, to it Therefore m, is the proper...
Pagina 15 - ... know that the line HI is to be drawn parallel to AB, and we only require to know at what distance it must be drawn from it.* To ascertain this, we measure the perpendicular distance CM, of the given line from the perspective plane, and set off this distance from C to q. We then draw the line G q, cutting the line CD in m, and the line hi, drawn through m, parallel to the ground line AB, is the perspective situation of the line HI, required. The reason of this will appear...
Pagina 3 - ... variety of scales is useful to lay down lines of any required length, and of a convenient proportion with respect to the size of the drawing. If none of the scales happen to suit the purpose, recourse should be had. to the line of lines on the sector ; for, by the different openings of that instrument, a line of any length may be divided into as many equal parts as any person chooses. Scales of equal parts are divided into two kinds, the one simple, the other diagonally divided. Six of the simply...
Pagina 61 - Then we divide the line th, in the same proportion as kf; and by this means get a scale, by which we can measure any other line in the picture, or insert in it other objects of any given magnitudes. Mechanical Perspective. — To avoid wholly the delay and trouble of computation, artists frequently make...
Bibliografische gegevens
| Titel | A Familiar Introduction to the Theory and Practice of Perspective Eighteenth century collections online |
| Auteur | Joseph Priestley |
| geïllustreerd door | Joseph Priestley |
| Uitgever | J. Johnson and J. Payne, 1770 |
| Oorspronkelijk uit | Universiteit Gent |
| Gedigitaliseerd | 17 jan 2008 |
| Lengte | 132 pagina's |
| Citatie exporteren | BiBTeX EndNote RefMan |