Sheet of mechanisms, springs, flutes and a treadwheel

Continuous-tone flutes played like the voice

Two flutes marked b and a are described as not changing their notes by leaps but in the proper manner of the human voice, achieved by moving the hand up and down as with the bent trumpet, especially in the whistle a; they can sound eighths and sixteenths of a note, as many as one pleases.

Man-powered wheel acting as a balance

The large wheel mounted by a man is noted as being almost of the nature of a wheel, so that it becomes a balance and is very easy in its motion.

Springs, screws and rimmed wheels

A circular figure carries a spring that trips and should intersect beneath the screw, while a sectioned pinion is engaged by a screw with its male thread. Wheels bear elements applied to the circumference labelled goes out - comes in, comes in - goes out.

A black object on a white field

In the upper left half an observation begins, whoever looks at the black thing in the white field, but the transcribed note breaks off before its conclusion; further untranscribed text may continue this remark on the sheet.

Air passing through a uniform channel

Beside a bellows fitted into a horn, Leonardo notes that if air runs through a uniform channel and a little is introduced at one end, just as much comes out at the other; a nearby figure of a bellows is labelled a water bellows.

Metà destra. Figura circolare:

Due flauti, con:

Grande ruota montata da un uomo:

Figura di soffietto:

Metà sinistra, dall'alto.

Probabile soffietto inserito in un corno:

Sezione di rocchetto:

Cerchi o ruote con elementi applicati alla corconferenza, con:

Tra due figure:

Right half. Circular figure:

Two flutes, with:

Large wheel mounted by a man:

Figure of a bellows:

Left half, from the top.

Probable bellows inserted in a horn:

Section of a pinion:

Circles or wheels with elements applied to the circumference, with:

Between two figures: