Multiples 3 6 9 with a diagram of the earth's sphere
Number series labelled 'multiples' beside balance-like figures and a curved segment of the globe
The page pairs number work with geometric diagrams. The transcribed figures give the series 3 6 9 against 1 2 3, the single terms 3 and 6, and the label 'multiples', all belonging to the notebook's study of proportion. Above and below are drawings: a large curved arc representing a portion of the terrestrial sphere with sight-lines running to it, and rows of small beam-and-weight figures marked with numbers that read like balances.
On this page
Series of multiples: 3 6 9 against 1 2 3
The written figures set the row 3 6 9 above 1 2 3, isolate the terms 3 and 6, and carry the label 'multiples'. Together they lay out a simple table of multiples used to demonstrate proportion. The series is repeated on the sheet.
Segment of the terrestrial sphere with sighted heights
A broad arc drawn across the upper sheet stands for a portion of the earth's sphere, with lines drawn to sight various heights against one another. It presents the curvature of the globe as a geometric figure. No prose accompanies the diagram.
Rows of beam-and-weight (balance) figures with numbers
Small figures of a horizontal beam carrying a hanging element, each tagged with numbers such as 3, 6 and 9, run in rows across the middle and lower sheet. They read as balances relating weights and distances proportionally. They tie the number series to a mechanical demonstration.