Motion of waves and currents; the angle of contingency

The two motions of a wave

Waves have two motions: the principal one lies in the middle of the width and thickness of the wave; the non-principal one is the oblique, that is lateral, motion of the principal.

Colliding currents leap up and scour the bed

All running waters that meet one another from whatever direction leap upward and acquire weight, striking and hollowing the bottom that supports them. Of waters striking the bottom from different directions, the greater percussion comes from the one falling by the more direct line.

The angle of contingency divisible to infinity

The angles of contingency are divisible to infinity, and one same point is the common terminus of all, as seen in straight lines intersected like a star. The angle is a space interposed between two lines converging to one point, which point is indivisible and the common terminus of infinite angles.

Floods and ebbs of rivers entering the sea

Water moving in one same direction is of lesser depth where its course is swifter and greater depth where slower, at equal width and uniform motion. Swifter water lifts more and deposits where it slows; water in circular motion is slower the farther it is from the centre and faster the nearer.

Colonna destra.

Appendice sul margine:

Figura colle lettere:

Colonna sinistra.

Da destra a sinistra. Rettangoli con:

Sotto le figure di cerchi e di ' stelle ' :

In basso, triangolo e quadrati, con:

Right column.

Appendix in the margin:

Figure with the letters:

Left column.

From right to left. Rectangles with:

Below the figures of circles and 'stars':

Below, triangle and squares, with:

Motion of waves and currents; the angle of contingency

On this page

The two motions of a wave

Colliding currents leap up and scour the bed

The angle of contingency divisible to infinity

Floods and ebbs of rivers entering the sea