River meanders, a pulley, and a crenellated building
Dated at Cesena, mid-August 1502
A note on river hydraulics reasons that the less curved the bank is where a river's current rebounds, the farther downstream its next impact will fall, keyed to the points a - c - b of the winding channel drawn above. Beside it a pulley block hangs from a hook (captioned 'pulley'), and the lower half carries the elevation of a low, crenellated arcaded building. A memorandum dates the page to the feast of Santa Maria in mid-August 1502, at Cesena, placing Leonardo in Romagna during the Borgia campaign.
On this page
How a river's rebounding current spaces its impacts
The transcription states that the less curved the bank is where the river's leap strikes back, the more remote the second leap will be from the place the first set out. The reference points along the serpentine channel are lettered a - c - b.
Pulley block (carrucola)
A block-and-pulley is sketched hanging from a hook at the upper right, captioned simply 'pulley.' No further note accompanies the device.
Elevation of a crenellated building
The lower half shows the front elevation of a low, arcaded building topped by crenellations, drawn in quick pen strokes as a battlemented facade.
Dated at Cesena, 1502
A dated memorandum records the day of Santa Maria in mid-August 1502 at Cesena. It fixes the moment and place of the page during the Romagna campaign.