830 550 Burmester curves set
Year: 1984

830550 Set of Burmester curves

made of yellow transparent plastic
with double faced matt tracing edge.

Set of 3 curves in plastic wallet

The matt tracing edge allows curve sections
to be marked in pencil.

A French curve is a template usually made from metal, wood or plastic composed of many different segments of the Euler spiral (aka the clothoid curve).
It is used in manual drafting and in fashion design to draw smooth curves of varying radii.
The curve is placed on the drawing material, and a pencil, knife or other implement is traced around its curves to produce the desired result.
They were invented by the German mathematician Ludwig Burmester and are also known as Burmester (curve) set.

Rotring had many different versions of these including Primus (pre 1983) and transparent ones (available from 1986.)
This version was sold from 1984. until aprox 2000. from when only tranparent version was made.

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