“The spool collecting the combined thread needs to stop immediately.”
Silk manufacture was already at an advanced stage in Leonardo's day. Leonardo studied the spindles for silk utilized in Milan and proposed certain improvements, so as to be able to realize, with a single movement by the operator, the combining and twisting of two threads. Besides speeding up manufacture, the machine here reproduced features an automatic stop device that is triggered when one or two threads break.
The model is based on the drawing:
- Codex Atlanticus f. 103 a. r. (1497)
Milano, Biblioteca Ambrosiana