In this axle study, the movement is transmitted
to only one wheel by means of the pinion
(or lantern sprocket), while the other wheel is
free to turn at a different speed, in accordance
with the curvature of the street, apparently anticipates the idea for the "differential gear", which Leonardo highlighted in later drawings.
The reduction of friction resistance in the pivots
and the amplification of human force by means
of gears make this study an interesting example
of the application of different branches of knowledge.
The model is based on the drawing:
- Codex Atlanticus f. 17 v. (1478)
Milano, Biblioteca Ambrosiana