The ruler indicated in the illustration is commonly referred to as a/an _________. Illustration GS-0023

Correct Answer: Option B — Engineers Scale

An engineer's scale is a triangular ruler typically divided into decimal increments, such as 10, 20, 30, 40, 50, or 60 parts per inch. This tool is essential for accurately scaling mechanical drawings and blueprints used in shipboard maintenance, piping layouts, and structural engineering tasks.