Clock gear-trains, an escapement and a colour recipe

Gear-train numbered first to fourth mobile

The wheels of the train are labelled fourth mobile, third mobile, second mobile and prime mobile, and an analogous figure adds a fan made in the manner of a clock with a branch, driven from the prime mobile through a pinion 6, wheel 36 and teeth 39.

One-tooth wheel tripping a toothed release

At the centre Leonardo explains that when the release trips it must carry the cause of its releasing, a wheel full of teeth, and that this wheel is moved by a wheel bearing only a single tooth which, in one whole turn driven by the timepiece, touches one tooth of the releasing wheel.

Counterweight support for greater leverage

A figure marked with a weight carries a candlestick-like support set at the thicker part for greater leverage, working by contrary; nearby a wheel is noted as turning in one hour and a set of stop-teeth as giving exactly three turns for the twenty-four hours.

Recipe for grinding and layering colours

The lower margin gives a painter's method: grind the colours with glue and never refresh them except with water; shade with black and heighten with red, lay lake over it without tempera, and then shade with gum.

Multiplication of 15 by 15

At the lower left a worked multiplication sets 15 against 15, giving the partial products 75 and 15 and the total 225.

Metà destra. Figura, con:

Continuando lungo il margine destro. Sistema di ruote, con

Figura analoga, con:

Al centro, congegno con ruote dentate:

In basso, giunto meccanico, con:

Congegno con ruota che:

Margine inferiore.

Metà sinistra, margine sinistro. Figura di denti d'arresto:

Figura adiacente, con:

Operazione aritmetica:

Right half. Figure, with:

Continuing along the right margin. System of wheels, with

Analogous figure, with:

At the centre, mechanism with toothed wheels:

Below, mechanical joint, with:

Mechanism with a wheel that:

Lower margin.

Left half, left margin. Figure of stop-teeth:

Adjacent figure, with:

Arithmetic operation: