A man-powered treadwheel and cart-wheel motion
The worker loads his full weight on the rungs; power grows with distance from the axle
The notes describe motion running from a toward b, with a taken as the pole (axle) of the cart's wheels (text 2). In the treadwheel a man must grip the rungs with his hands so that his whole weight bears on the wheel (text 4), and the power grows the further the weight's perpendicular stands from the axle center, cited to the 7th of the 4th (text 5). The drawings show a two-wheel treadle frame with crossed braces, a wheel drawn in plan, and a large treadwheel worked by a figure labelled famiglio (servant).
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A man in the treadwheel loads his full weight on the rungs
In this wheel the man must hold on with his hands to the rungs of the wheel, so that all of the man's weight is loaded upon it. The lower drawing shows the treadwheel and the figure lettered n, f and marked famiglio (servant) who works it.
Power grows as the weight's perpendicular leaves the axle
The more the perpendicular of the weight that moves this wheel is distant from the center of its pole, the greater its power, cited to the 7th of the 4th. This states the lever principle governing the treadwheel's driving effort.
Motion from a to b about the cart-wheel axle
The motion runs from a toward b, with a taken as the pole (axle) of the cart's wheels. The note keys the upper geared frame and its wheels lettered a, b.