What is a common tool used in mechanical drawing?

A T-square is a fundamental tool in mechanical drawing, primarily used for drawing straight lines and ensuring the accuracy of visual representation on a drafting surface. It consists of a long, straight edge (the blade) and a shorter perpendicular piece (the head), which helps in aligning the ruler to a specific angle or to the edges of the drafting board.

The precision offered by a T-square is crucial in mechanical drawings where exact dimensions and angles are imperative for creating clear and effective designs. It assists in establishing horizontal lines and allows drafters to create clean, straight guidelines for other drawing instruments to follow. This tool is essential for anyone involved in technical drawing, drafting, or design processes in mechanical fields.