projection. The finished drawing is then reproduced and sent
to the shop or to the job site.
To design and communication every detail to manufacturing
groups (Engineers, technicians) descriptions must be
prepared. This description must show every aspect of the
shape and size of each part and of the complete structure.
Because of this necessity graphics is the fundamental method
of communication only as a supplement, for notes and
specifications, is the word language used.
Shape is described by projection that is by the process of
causing an image to be formed by rays of sight taken in a
particular direction from an object to a picture plane. Methods
of projection vary according to the direction in which the rays
of sight are taken to the plane. When the rays are
perpendicular to the plane, the projective method is
Orthographic. If the rays are at an angle to the plane, the
projective method is called oblique. Rays taken to a particular
station point result in perspective projection. By the methods
of perspective, the object is represented as it would appear to
the eye.
Theory of projection is the basis of background information
necessary to shape representation in graphics. Two
fundamental methods of shape representation are used.
- Orthographic view consists of a set of two or more
separate views of an object taken from different