Scale RF and types of scale

Scale

• Scale of map or plan represents the ratio of a line on map (or plan) to the length of the same on ground.

• A scale may be represented numerically by Engineer's Scale or Representative Fraction

• The Engineer's scale is represented by a statement, eg 1cm = 100m

• When a Scale is represented as a fraction, it is called Representative Fraction

Engineer's scale 1cm = 100m

Representative Fraction (R.F.) = $\bf \frac {1}{10000}$

$\bf \frac {1}{10}$ scale is larger scale than $\bf \frac {1}{100}$ scale

Representative fraction

• The ratio of the distance on the drawing to the corresponding actual length of the object on the ground is known as the representative fraction.