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Library/Paris Manuscript H/70

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Paris Manuscript H — 70

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Bibliothèque de l'Institut de France, Paris

A penna sopra tratti di figure a sanguigna.

De' canali delle molina.

Quell'acqua che dà men peso al suo canale, è più veloce.

Quell'acqua ch'è più veloce, più caccia la sua rota. Quella dà men peso al suo canal, ch'è più diritta.

Schizzo di ruote idrauliche, con:

S r o - m n a

L'acqua delle molina debbe percotere le pale delle rote in angoli retti.

Quell'acqua che correrà con manco pendente, percoterà la rota più lontano dal perpendiculare della sua caduta.

Quell'acqua che percote più lontano dal perpendicular della sua caduta, dà minor botta.

In pen over strokes of red-chalk figures.

Of the channels of mills. That water which puts less weight on its channel is faster. That water which is faster drives its wheel more. That which puts less weight on its channel is the straighter one.

Sketch of hydraulic wheels, with:

s r o - m n a. The mill water must strike the blades of the wheels at right angles. That water which flows with less slope will strike the wheel farther from the perpendicular of its fall. That water which strikes farther from the perpendicular of its fall gives a lesser blow.

Mill channels and how water strikes the wheel

Straighter, faster channels drive the wheel harder; water should hit the blades squarely

Hydraulics Machines & Devices

Pen notes over red-chalk figures set out the hydraulics of mill races. Water that presses less on its channel runs faster and drives the wheel more, and the channel that loads its bed least is the straighter one. A row of three wheels drawn on a horizontal line, lettered s r o above and m n a below, accompanies rules that mill water should strike the blades at right angles, and that water on a gentler slope hits the wheel farther from the perpendicular of its fall and so gives a lesser blow.

On this page

Straighter channels carry faster water

Water that puts less weight on its channel is faster, and the faster water drives its wheel more; the channel that bears least weight is the one that is straighter. The remarks concern the races that feed mills.

Water should strike the wheel blades at right angles

Lettered s r o - m n a, the sketch of hydraulic wheels supports the rule that mill water should strike the blades of the wheels at right angles. Water flowing on a gentler slope strikes the wheel farther from the perpendicular of its fall, and so delivers a lesser blow.

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