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...Freehand sketching lines polygons or is a first step to the preparation of scale drawing i e drawn with aid instruments only pencil and eraser designer records his ideas initially in form sketches which are later converted into drawings similarly views actual objects instance sketched then prepared from these can be described words but description made more expressive thus great importance engineering practice always done it fact correct proportions not sketch should so as give others clear idea complete information true impression object constructed never too small size such that all features together their dimensions explanatory notes etc clearly incorporated proficiency achieved constant materials soft grade preferably hb h sharpened conical point ii rubber iii paper book pad above three things absolutely essential for sometimes cross section graph ruled light also used instead plain squares help straight maintaining papers may readily available advisable learn without procedure edg...