A drawing standard

From time immemorial, drawings have been the medium used to convey ideas and intentions. Hence the adage that 'a picture is worth a thousand words'. No need for language, the picture tells it all. In recent years there has, unfortunately, developed another opinion since CAD appeared on the scene, that there is no need for a draughtsman now as the computer does it all. The truth of the matter is that the computer is able to extend the range of work undertaken by the draughtsman and is really a very willing slave. The evolution of the Industrial Revolution required the 'pictures' to be more detailed. In the pre-mass-production era, manufacture was based on 'matched fits', with the assistance of verbal communication. The advent of mass production however, demanded more specific and precise specifications.

A national form of draughting presentation was needed to promote a common understanding of the objectives and in September 1927, BS 308 came to fruition, as the recognized National Code of Practice for Engineering Drawing.

The initial issue was A5-size and contained only 14 clauses. Dimensioning was covered in four paragraphs and tolerancing in only one. The recommendations were based on just two example drawings. The recommended projection was first angle.

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