Circle Constructions and a Water-Filled Pipe
Points of a diameter joined to the circumference, and a question on where a pipe full of water is most stressed
At the right are two circles in which points on a diameter are joined by straight lines to points on the circumference, one construction citing 'the twentieth [proposition] of the [first book].' Below them a short length of pipe labelled a-b accompanies a question: where is the pipe, when full of water, most stressed by the water — inside or outside — and by how much and why. The note pairs a geometric drawing with an early query into the pressure of water within a conduit.
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Points of a diameter joined to the circumference
In two circles, two points taken on a diameter are joined by lines to various points on the circumference. One figure is captioned as depending on 'the twentieth [proposition] of the [first book].'
Where a water-filled pipe is most stressed
Beside a short drawn pipe marked a-b, Leonardo asks where the pipe, when full of water, is most strained by the water — on its inside or its outside — and by how much and why. The question probes the internal pressure of water in a closed conduit.