. Free-hand drawing : a manual for teachers and students. upon a horizontalsurface below and at the left of the eye, — the camera. This picturedoes not cause the reader to think of a sphere, but it does create theidea of a cube, because cubes have been represented in this way sogenerally that the average person accepts the drawing as a satis-factory representation of the cube. But it is evident that if theinclined ellipse which represents the sphere, is a distortion, therepresentation of the cube below it must be as much distorted, andactually it is more distorted than the ellipse. If the eye
. Free-hand drawing : a manual for teachers and students. upon a horizontalsurface below and at the left of the eye, — the camera. This picturedoes not cause the reader to think of a sphere, but it does create theidea of a cube, because cubes have been represented in this way sogenerally that the average person accepts the drawing as a satis-factory representation of the cube. But it is evident that if theinclined ellipse which represents the sphere, is a distortion, therepresentation of the cube below it must be as much distorted, andactually it is more distorted than the ellipse. If the eye is placed 1 letters are often used to designate the centre of vision, or the pointon the picture exactly opposite the eye of the spectator. At this point all linesperpendicular to the picture plane vanish. SCIENTIFIC PERSPECTIVE AND MODEL DRAWING. 85 at the station-point, which for Fig. 20 is about 5^ from the paperand in a perpendicular to the page erected at the point marked CV,the drawing will be seen obliquely and so foreshortened that the. Fig. 20. Perspective of a Sphere and Cube. ellipse will appear a circle, and the representation of the cubewill cause the same image in the eye that the cube does. Figs. 18and 20 are distorted because they are made on a vertical pictureplane through which the visual rays pass obliquely. Fig. 21 is a side view representing the sphere situated as in with a picture plane touching the sphere, and so inclined 86 FREE-HAND DRAWING.
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Photo credit: © The Reading Room / Alamy / Afripics
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Keywords: ., bookauthorcr, bookcentury1800, bookdecade1890, booksubjectdrawing
