Instrumental drawings are different from freehand drawings (see
above), although they are usually the result achieved through the
development of ideas using freehand drawings (including sketches).
Freehand drawing and instrumental drawing differ primarily in the
amount of time and accuracy required - freehand drawing is a means of
quickly putting your thoughts down on paper without the use of
instruments such as rulers, set squares and compasses. So, in
appearance, the freehand drawing is entirely different from the
clean-cut precision of a mechanically ruled or computer generated
instrumental drawing.

Instrumental drawings  
sometimes referred to as technical drawings,
mechanical drawings or working drawings require the use of manual (using
drawing instruments  
examples from the past ) and/or electronic drawing
methods. They are often
orthogonal (also referred to as 'orthographic')
drawings, but may be
paraline drawings such as isometric, oblique and
planometric drawings -
usually used as 'support' drawings showing a 3D view
of the object shown in orthogonal/orthographic drawings
.


                                                                             
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