BS 2457 is a British standard that discusses the specifications for protractors. Protractors help to measure and draw angles. These are available in semi-circular and circular shapes to have a measurement of 180° to 360° respectively.
BS 2457 specifies requirements for protractors of the circular and semi-circular types for drawing office use, made from transparent plastics material.
BS 2457 on specification for protractors is relevant to:
Drawing tools may be used for measurement and layout of drawing. A protractor is one such tool used in drafting and drawing, that helps with drawing and measuring angles.
BS 2457 provides best industry guidance on material, requirements, dimensions and marking of protractors for drawing office use.
Preferred sizes for protractors including the minimum diameter and thickness are also covered in BS 2457.
Thus, if you are a manufacturer or designer of protractors for drawing office use, compliance with BS 2457 can ensure your products are fit for its intended use.