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heavy solid black line drawn close to the outer edge of paper used to draw plans


a picture or likeness made with pencil, pen, chalk, crayon or other instruments

Extension Line

solid lines showing the exact area specified by the dimensions

Hidden Line

a series of dashes that indicate unseen edges

Object Line

solid line in a drawing that shows the visible edge of an object


an instrument with all the increments shortened according to proportion; numbers and graduations on measuring tools; a rigid steel rule or measuring device; the size of
a plan compared with that of the object that it represents


a rough drawing of an idea, object or procedure

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