Engineering & Technology


Drawing Scales - reduction

Objects in the real world are usually too big to fit on a sheet of paper full size. Think of an architects drawing of a house, it clearly isn't practical to have a sheet of paper the size of a house! We therefore scale down, or ​reduce​ ​​the original dimensions. We do this in terms of ratios, dividing the measurements by the scale.

Drawing scales - enlargement

When engineers work from drawings, they need to know the scale so they know the real size of the object they are working with. We use the opposite of reduction and call this  enlargement . Its simply a matter of multiplying the measurements on the drawing by the scale: