Leonardo devised this interesting machine, in his endeavour to produce teased lengths of wool. Soaked in an alkaline solution, wool fibres emerge compact and stiff, with a tangle of filaments jutting out. Teaseling consists in tidying and straightening this tangle, by raising and smoothing the filaments in order to make that characteristic fibre which makes wool capable of retaining heat. The machine is constituted of a work base on which five pairs of rollers are positioned, each stretching a ring of pieces. Five rollers at one side are positioned on a transmission shaft connected via pinion to a toothed wheel with a crank. The advantage of this machine consists in being able to work the pieces several times without stopping, since they are formed into a continuous ring.
The model is based on the drawing:
- Codex Atlanticus f. 106 r. (1495)
Milano, Biblioteca Ambrosiana