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Library/Paris Manuscript E/12

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Paris Manuscript E — 12

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Bibliothèque de l'Institut de France, Paris

Dell'ombra e suo moto.

Sezione di muro con finestra, due corpi ombrosi, con:

m n - a S - b - c d h - p o

Delli 2 ombrosi che l'un dopo l'altro s[t]an in fra la finestra e la pariete, con alquanto spazio s'interponghino, l'ombra dell'ombroso, che sarà vicina alla pariete del muro, sarà mobile, se l'ombroso propinquo alla finestra fia in moto traversale a essa finestra. Provasi, e sian li due ombrosi a b interposti in fra la finestra n m e la pariete o p con alquanto spazio interposto in fra loro, il quale è lo spazio a b. Dico che se l'ombroso a si moverà in verso S, che l'ombra dello ombroso b, la quale è c, si moverà in d.

Dello stillare la ollac1 a feltro.

Se volli stillare la ollac a feltro, bisogna il sole calorosissimo e fervente, che tenga liquefatta e sottile tal materia.

E se lo voi fare di verno,

fallo in istufa in modo la materia stillata non si secchi nel feltro d'essa stillatore.

On shadow and its motion.

Section of a wall with a window, two shadow-casting bodies, with:

m n - a S - b - c d h - p o

Of the two shadow-casting bodies that stand one behind the other between the window and the wall, with some space set between them: the shadow of the shadow-casting body that is near the wall will be movable, if the shadow-casting body near the window is in transverse motion relative to that window. It is proved: let the two shadow-casting bodies a b be placed between the window n m and the wall o p, with some space set between them, which is the space a b. I say that if the shadow-casting body a moves toward S, the shadow of the shadow-casting body b, which is c, will move to d.

On distilling the ollac through felt.

If you wish to distil the ollac through felt, you need the sun very hot and burning, so that it keeps such matter liquefied and thin.

And if you wish to do it in winter,

do it in a stove, so that the distilled matter does not dry in the felt of the still.

The motion of shadow; distilling through felt

How the shadow of a body near the wall shifts when a nearer body moves; a note on distilling through felt

Optics & Light Personal Notes

Under the heading 'On shadow and its motion,' Leonardo examines two shadow-casting bodies set one behind the other between a window and a wall: if the body nearer the window (a) moves transversely toward S, the shadow (c) of the body nearer the wall (b) shifts to d. A sectional diagram of a wall with a window carries the labels m n, a, S, b, c, d and o p. A separate note explains that to distil a substance through felt one needs a very hot sun to keep it liquid, and that in winter the work should be done in a stove so the distilled matter does not dry in the felt.

On this page

The moving shadow between two bodies and a wall

With two shadow-casting bodies a and b placed one behind the other between the window m n and the wall o p, the shadow near the wall becomes mobile when the body near the window moves across the window. Leonardo proves that if body a moves toward S, then the shadow c of body b moves to d.

Distilling through felt

To distil the material through felt, Leonardo notes, one needs a very hot and burning sun to keep the matter liquefied and thin. If the work is done in winter it should be carried out in a stove so that the distilled matter does not dry within the felt of the still.

Reader's Edition — described with AI from the e-Leo transcription.