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Figure 11.2. A chain

Measuring tapes (see Figure 11.3.) are made of steel, coated linen,

or synthetic material. They are available in lengths of 20, 30 and 50 m.
Centimetres, decimetres and metres are usually indicated on the tape.

Figure 11.3. A measuring tape

A measuring rod (see Figure 11.4.) is a straight lath with a length
varying from 2 m to 5 m. The rod is usually marked in the same way
as a measuring tape, indicating centimetres, decimetres and metres.

Figure 11.4. A measiring rod
A plumb bob is used to check if objects are vertical. A plumb bob
consists of a piece of metal (called a bob) pointing downwards, which

is attached to a cord (see Figure 11.5.). When the plumb bob is
hanging free and not moving, the cord is vertical.

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