Orthographic drawings represent the object being drawn or designed as flat. They can represent the design as linked individual drawings from all sides. This is usually referred to as plan, front and side elevations.
They can best be described as representing a silhouette of an object on the picture plane from one side or the other of the plan. They show one face of the object and from that face the other faces can be planned and plotted. This is technically referred to as the first angle projection. First introduced by a French military engineer, Monge, at the beginning of the 18th century, it was very quickly adopted.
Orthographic drawings represent the object being drawn, or the face of, and from that face the other faces can be planned and plotted.
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