Proportions among labelled line-segments (a-d)
Four short segments carrying numeric lengths, in constant ratio
The sheet sets out short horizontal line-segments, each lettered and given a numeric length: a with 8 and c with 6 in the upper row, b with 4 and d with 3 below. The paired values keep a fixed ratio (a:b and c:d both fall as 2:1), a specimen of Notebook K's running study of proportion among magnitudes. The lines are laid in pencil and reworked in pen, as the folio heading records.
On this page
Four line-segments in constant ratio
Two rows of lettered segments carry the lengths a = 8 and c = 6 above, b = 4 and d = 3 below. Read column-wise the pairs a:b and c:d each hold the ratio 2:1, while across the rows a:c and b:d hold 4:3. The figure isolates the same proportion at two scales.