Rules

Rules may be either rigid or flexible and are used as a measuring tool or as a straight edge. It is important to be careful when using measuring devices. These precision tools are accurately marked with very delicate components. The inch is a measuring unit used in aircraft industry, which may be divided into smaller parts by either common or decimal fraction divisions.

The following are the two main types of rules.

The Steel Rule: This is a rigid type rule that is made from high carbon steel hardened and tempered. It is usually graduated in imperial and metric units. After use, clean and lightly oil to keep it free from rust.

FIGURE

Tape Measure: This is a flexible type rule that is made of linen or flexible steel. It is available in various lengths marked with imperial and metric scales. Stretching the tape will affect the indicated measurement.

FIGURE