Cycloidotrope: 'The Invisible Drawing Master'

Cycloidotrope: 'The Invisible Drawing Master'. E Marshall, 78 Queen Victoria Street, London EC. Slide for magic lantern, generating geometrical patterns on smoked glass; fully adjustable, producing very wide range of designs. Stylus arm and part of wooden guide missing (replaced November 1975). With instruction sheet. In wooden tray.

The Cycloidotrope was a slide with an adjustable stylus bar for drawing geometric patterns on sooty glass when hand cranked during projection. The patterns are similar to those produced with a Spirograph.