Bifurcation of a channel and its water levels
Why the two divided streams settle to nearly one level.
A faint red-chalk diagram shows a channel dividing into branches, its parts marked m, r, a, n, o and c. The accompanying note reasons that because the branch n c is about as wide as a o, and m r only a little narrower, the divided waters will stand at almost a single level. The drawing is heavily faded and shows through from the facing leaf.
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Divided channel resolving to one water level
The note labels the parts of a bifurcating channel m r, a n and o c, and argues that because n c is nearly as wide as a o, and m r only slightly less, the waters in the branches will lie at almost the same level.