Overview of divisions of reduction scales / triangular scales
- Division DIN / Engineer (F): 1:2.5 / 5 / 10 / 20 / 50 / 100
- Division 1 Architect (A): 1:20 / 25 / 50 / 75 / 100 / 125
- Division 2 Vocational school (D): 1:20 / 25 / 33.33 / 50 / 75 / 100
- Division 4 Architect (B): 1:100 / 200 / 250 / 300 / 400 / 500
- Division 6 Surveying (C): 1:500 / 1000 / 1250 / 1500 / 2000 / 2500
- Division 7 Surveying €: 1:50 / 100 / 200 / 250 / 1440 / 2880
- Division 9 Mechanical engineering (G): 1:15 / 20 / 25 / 33.33 / 50 / 100
Overview of lengths
- 15 cm – pocket size ‘for on the go’
- 30 cm – standard size
- 50 cm – for extra-large drawings that are drawn ‘by hand’
Triangular rulers are usually 30 cm long. Today, they are made of polymer material or, in high-quality versions, of light metal (aluminium). When selecting the materials, particular importance is attached to dimensional accuracy. In the past, triangular rulers were also made of wood and covered with scales made of aluminium or, later, with a high-quality polymer material that was temperature-resistant and dimensionally stable. The triangular ruler is mainly used when working with different scales and time-consuming conversions are to be avoided.
In order to accommodate 6 different scales on one ruler, the scale has a star-shaped cross-section with three rays. Due to its design, the triangular scale cannot be used for drawing; its sole function is to measure dimensions in scale-printed drawings and plans.
