Hauling Machine Worked by Men, with a Horse Study
Notes on the force needed to work the device, which two operators can relieve in turns
The lower half of the sheet shows a man working a large wheeled machine fitted with a toothed rack, presented in two figures. Leonardo notes that the pull must exert far more force than the weight of the man together with his instrument, and that one operator can raise and lower the mechanism whenever his companion wishes to rest. A rapid study of a horse occupies the top of the sheet.
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Force of the pull versus the operator's weight
In the first figure Leonardo observes that the pulling action must have far greater force than the weight of the man together with the instrument he works, framing the device as a mechanical advantage problem.
Two men relieving one another at the machine
In the second figure the operator can raise and lower the mechanism whenever his companion wishes to rest, so that two men may work the wheeled, racked device in turns.
Study of a horse
A quick pen study of a horse, seen from the side with legs extended, is drawn across the top of the sheet, unrelated to the notes on the machine below.