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Perspective Drawing

projection, plane, lines, horizontal, inches and planes

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PERSPECTIVE DRAWING.

The view to be shown is indicated by the diagram. The station point is to be at inches in front of the picture 'plane. The position of SPv is given. The perspective projection is to rest upon a horizontal plane -2 inches below the level of the eye. Invisible lines in the perspective projection should be dotted.

To find the perspective of a cube the sides of which are l inches long, resting on a horizontal plane inch below the observer's eye.

The nearest edge of the cube is about 11- inches behind the picture plane, as shown by the relation between -the given diagram and The station point is to be 31 inches in front of the picture plane. The positimi of SP" is given. Invisible edges of the cube should be dotted in the perspective projection.

To find the perspective of a cube similar to that in the last problem.

The position of the cube is such that it intersects the picture plane as indicated 'by the' relation between the given diagram and HP P. The cube is supposed to 'rest on the horizontal plane represented by VII,. The station point to be 31 inches in front of the picture plane: The position of SP" is given. Invisible edges should be dotted in the perspective projection.

Block pierced by a rectangular hole.

The plan and elevation given in the figure represent a rectan gular block pierced by a rectangular hole which runs horizontally through the block from face to face, as indicated. The diagram, TIPP, and the position of SP" are given. The block is to rest on a horizontal plane 2 inches below the observer's eye. The observer's eye is to be61- inches in front of the picture plane. Find the per spective projection of the block and of the rectangula'r hole. All invisible lines in the perspective projection should be dotted.

Find the perspective projection of the house shown in plan, side and end elevations.

The diagpam, IIPP, and the projections of the station point arc given. The house is supposed to rest on a horizontal plane inch below the observer's eye. Invisible lines in this per spective projection need not he shown except as they may be needed for construction. All necessary construction lines should

be shown ; but the points in the perspective projection need not be lettered, except a", P', e", and d".

• The plate shows the plan, front, and side clevationo of'a house. In order to assist the student understanding these drawings, an oblique projection (at one-half scale) is given, with the visible lines and planes lettered to agree with those in the plan and elevations.

The problem is, first, to find a complete Vanishing Point Diagram (j• 75) for the house in the position indicated by the given diagram; second, to draw the perspective projection of the house, resting on a horizontal plane six inches below the level of the observer's eye. The projections of the station point.are given. • There will be, including the vertical system, eleven systems of lines and eight systems of planes in the vanishing point dia gnun.

The lines of these systems can most easily be iden tifiedby first finding their horizontal projections on the plan. • In finding the vanishing points for the different systems, the student should proceed in the following order :— • , 1st. Draw VII the vanishing trace for all hoilitontal planes. 2d. Find va°, the vanishing point for all horizontal lines in the house that vanish to the right.

3d. Find ed, the vanishing point for all horizontal lines van ishing to the left.

4th. Find v°". The line on forms the intersection of the ' planes .N, and LT, (see oblique projection). To this same system belong the lines rq, ts, and zy. , 5th. Find v"!".. The line um forms the intersection of the planes and T,J, (see oblique projection). To this same system belong the lines qp, vu, and zoo. • 6th. Find O. The line ji forms the intersection of the planes S and V,. The lisle jk also belongs to this same system.

7th. Find vig. The line ly forms the intersection of the planes R and V,. The line kh also belongs to this system.

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