A drawing scale is an essential component for drawing. Almost every line on a drawing must be a measured line. If the drawing has to be made accurately, one must be able to make accurate measurements. Measurements are made with scales. In drafting, architecture and engineering the term scale has two meanings. A scale is a dimension that represents the structure shown in a plan. A scale is also a ruler used in drawing and measuring architectural and engineering plans. Thus the term scale means both the device or tool for making measurements and the size to which the drawing is made.
A scale is a ruler that is used for measurement in drawing. Different scales are made for specific measurement use in engineering, mechanical drafting, architecture and metric engineering. All scales are available in a wide variety of graduations and sizes. In drawing, the word scale not only means ruler, but also a dimension that represents the structure shown in a blueprint or plan.
Scales have graduations on the edges that show lengths used to indicate larger units of measurements, as 1/4th inch equals 1 foot.
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