A set square, called a triangle in American English, is a tool used in engineering and technical drawing to provide a straightedge set at a right angle, or at another particular fixed angle, to a baseline. It is typically made as a flat triangular piece of transparent plastic or wood, and a drafter uses its edges, held against a T-square or another straightedge, to rule precise straight or angled lines without measuring and marking each one by hand.
Facts
Open Questions
Introduced When (Circa)Not stated for the generic set square; a combined ruler-and-protractor variant (Geodreieck) dates to 1964 1 The source gives no invention date for the generic set square or triangle; it documents only that one later variant combining a triangle, ruler and protractor, the Geodreieck, was developed in 1964 by the German manufacturer Dennert and Pape Aristo-Werke. OriginThe generic set square or triangle has no attested invention date in the source; a later variant combining a triangle, ruler and protractor, the Geodreieck, was developed in 1964 by the German manufacturer Dennert and Pape Aristo-Werke. 1 Introduced era (class) In the Other Atlases
Sources
1. Set Square (Wikipedia)
Wikimedia FoundationGeodreieck section, sentence on the 1964 developmentQuote, Geodreieck section, sentence on the 1964 development
It was originally developed in 1964 by the German manufacturer Dennert & Pape Aristo-Werke
Reader Challenges (0)
No disputes yet. Spotted an error or a better source? Open the first one.
Sign in to dispute this or suggest a correction.