Motion of water: a vortex and water draining through a hole
With a question on which is swifter, a rising spark or a falling one
Rotated on the leaf, a note first poses a question of motion, asking which is swifter, a spark rising while 'alive' or falling back 'dead,' before turning to the 'motion of water.' At the centre a red-chalk drawing renders a vortex as lines spiralling into a core. A further note asks why the streams of water pouring into a hole do not run straight toward its centre.
On this page
Which is swifter: a spark rising or falling
The note asks which is the faster motion, a spark that goes upward while still 'alive,' or one that comes back down 'dead.' It frames a comparison of ascending and descending speed.
Vortex as the motion of water
Under the heading 'motion of water,' a red-chalk drawing shows fine lines curving and radiating into a central knot, depicting a whirl or vortex in a body of water.
Water pouring into a hole does not aim at its centre
A second note asks why the lines of water pouring into a hole do not straighten toward the centre of that hole, questioning the geometry of the converging stream.