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Codex Atlanticus — 0807 r

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© Veneranda Biblioteca Ambrosiana, Milan

In alto.

A fare odore.

To' buona acqua rosa e mollatene ne le mani; di poi togli del fiore di spigo e fregatelo fra l'una mano e l'altra, ed è buono.

Cilindro, con:

t – S – d c a b – g –f r n m

Per segnare la vite.
Dividi il primo tratto la testa della vite per 2 diamitri in croce, e così fa dall'altra testa. Di poi tira linie che partino dalle teste delle viti e vadino per lo lungo della vite, partendosi dalle teste de' diamitri di sopra e capiti alle compagne di sotto, come fa la linia S n che si parte dal diamitro S t. Di poi dividi il diamitro in 16 parti e piglia colle seste lo spazio d'un di que' sedecimi e pollo in testa alla linia r c, e poi poni alla linia n a 2/16, po' ne poni 3 alla linia m n e 4 alla linia g t, e hai posto nella testa della linia g t a punto 1/4 del diamitro di sopra; e quest'ha a essere la grossezza de' pani sua; e colle seste piglia il quarto di detto diamitro e va segnando giù di mano in mano. Di poi abbi un filo bene incerato e avvolgi su per la vite, toccando i fatti segni.

At the top.

To make a scent.

Take good rose water and moisten your hands with it; then take some lavender flower and rub it between one hand and the other, and it is good.

Cylinder, with:

t – S – d c a b – g –f r n m

To mark out the screw.
First divide the head of the screw by 2 diameters crossing in a cross, and do the same at the other head. Then draw lines starting from the heads of the screws and running along the length of the screw, setting out from the ends of the diameters above and ending at their counterparts below, as the line S n does, which starts from the diameter S t. Then divide the diameter into 16 parts and take with the dividers the space of one of those sixteenths and place it at the head of the line r c; then set 2/16 on the line n a; then set 3 on the line m n and 4 on the line g t, and you have set at the head of the line g t exactly 1/4 of the diameter above; and this is to be the thickness of its threads; and with the dividers take the quarter of the said diameter and go on marking downwards one after another. Then take a well-waxed thread and wind it up along the screw, touching the marks made.

Setting out a screw thread on a cylinder, with a scent recipe

Geometric method for spacing the threads of a screw, drawn on a lettered cylinder

Machines & Devices Geometry Personal Notes

A short note at the top of the sheet gives a recipe for a hand scent using rose water and lavender flower. The main text explains how to set out a screw thread on a cylinder: divide each end by two crossed diameters, draw lines down the length, then divide the diameter into sixteenths and step off a quarter of it as the thickness of the threads. The drawing at the right shows the cylinder with its construction lines and the lettered points t, S, d, c, a, b, g, f, r, n, m; a waxed thread is finally wound along the marks to trace the thread.

On this page

A recipe for a hand scent

A brief practical note: moisten the hands with good rose water, then take a little lavender flower and rub it between the palms to leave a pleasant smell. It stands apart from the technical instruction that fills the rest of the sheet.

Marking out the threads of a screw

The method sets out a screw thread on a cylinder: cross each end with two diameters, run lines along the length (as line S n from diameter S t), then divide the diameter into 16 parts and, with dividers, step 1/16 to line r c, 2/16 to line n a, 3 to line m n and 4 to line g t, giving a quarter of the diameter as the thickness of the threads. A well-waxed thread is then wound along the marks. The lettered cylinder at the right carries this construction.

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