Spiral stencil for e.g. drawing of golden spiral, has two parallel outlines formed at its both sides by basic function of golden spiral, and produced from half pin width and figure margin of specific percent of pin width

摘要

The stencil has two parallel outlines formed at its both sides by a basic function of a golden spiral, where the stencil is made of a piece of transparent material. The stencil can be shifted and rotated in a working pad. The outlines are produced from half pin width and a figure margin of about 5 - 20 percent of the pin width. The outlines are directed inwards and are guided further at spiral outer progression.