Principles of Architectural Perspective

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A. Mudge & Son, Printers, 1902 - Perspective - 93 pages
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Page 11 - ... like a black line crawling over the ground. It will be noticed also, that the speed of the train seems to diminish as it moves- away, for the equal distances over which it will travel in a given time, seem less and less as they are taken farther and farther from the eye. 10. In the same way, if several objects having the same dimensions are situated at different distances from the eye, the nearest one appears- to be the largest, and the others appear to be smaller and smaller as they are farther...
Page 20 - ... method will be found convenient, and has been adopted in these notes. If the student will letter each point or line as it is found, in accordance with this notation, he will be able to read his drawings at a glance, and any desired projection of a point or line may be recognized instantly. The picture plane (or vertical coordinate) is indicated by the capital letters PP. The plane of the horizon (or horizontal coordinate) is indicated by the capital letter H. A point in space is indicated by...
Page 58 - Prove analytically that the medians of a triangle meet in a point. 70. Prove analytically that the perpendiculars from the vertices of a triangle to the opposite sides meet in a point.
Page 20 - ... letters in the alphabet) with a capital V placed before it. The same letter preceded by a capital H indicates the trace of the plane upon the horizontal coordinate. The perspective of the vanishing trace of a system of planes is indicated by a capital letter preceded by a capital T. The perspective of the vanishing point of a system of lines is indicated by a small v with an index corresponding to the letter of the lines which belong to the system. PP = vertical coordinate, or picture plane....
Page 20 - ... etc., placed after the letter. The trace of a plane upon the picture plane is indicated by a capital letter (usually one of the last letters in the alphabet) with a capital V placed 'before it. The same letter preceded bjr a capital H indicates the trace of the plane upon the horizontal coordinate.
Page 88 - ... distinctly when about ten inches away. As one will seldom place a drawing nearer to his eye than the distance of distinct vision, a good general rule is to make the minimum distance between the station point and the picture plane about ten inches. For a small drawing, ten inches will be about right; but, as the drawing increases in size, the observer naturally holds it farther and farther from him, in order to embrace the whole without having to turn his eye too far to the right or left.
Page 11 - A railroad train moving over a long, straight track, furnishes a familiar example of this. As the train moves farther and farther away, its dimensions apparently become smaller and smaller, the details grow more and more indistinct, until the whole train appears like a black line crawling over the ground. It will be noticed also, that the speed of the train seems to diminish as it moves away, for the equal distances over which it will travel in a given time, seem less and less as they are taken farther...
Page 89 - ... apparent distortion is always greater when the assumed position of the observer's eye is too near than when it is too far away. In the former case, objects do not seem to diminish sufficiently in size as they recede from the eye. On the other hand, if the observer's eye is between the assumed position of station point and the picture plane, the effect is to make the objects diminish in size somewhat too rapidly as they recede from the eye. This effect is not so easily appreciated nor so disagreeable...
Page 7 - APPARENT DISTORTION. 114. There seems to exist in the minds of some beginners in the study of perspective, the idea that the drawing of an object made in accordance with geometrical rules may differ essentially from the appearance of the object in nature. Such an idea is erroneous, however. The only difference between the appearance of a view in nature and its correctly constructed perspective projection is that the view in nature may be looked at from any point, while its perspective...
Page 20 - ... is indicated by a small letter. The same small letter with an index v, H, or p, indicates its vertical, horizontal, or perspective projection, respectively. A line in space is indicated by a capital letter, usually one of the first letters in the alphabet. The same capital letter with an index v, H, or p, indicates its vertical, horizontal, or perspective projection, respectively. All lines which belong to the same system may be designated by the same letter, the different lines being distinguished...

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