Wedge-and-tooth haulage, likened to a screw
A curved wedge pressing a wheel-tooth by simple friction
A short note explains a hauling device: the pull is made by a curved wedge pressed by a weight, and may be reckoned as a screw because it moves by the simple friction of the wedge against the tooth of a wheel, which Leonardo calls a good and simple pull. The sheet is dominated by drawings, chiefly a large toothed wheel set in a frame with a bell-shaped weight hanging beneath it at upper right, over fainter underdrawings of a fuller mechanism. Further untranscribed writing is also visible at the head and foot of the page.
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Curved wedge driving a wheel-tooth
The pull is made by a curved wedge and a weight that presses it. It can be called a screw, because it is moved by the simple friction of that wedge against the tooth of the wheel, and it is a good and simple haulage.
Toothed wheel with a suspended weight
At upper right a large toothed wheel is mounted between uprights, with a bell-shaped weight hanging beneath it; lighter underdrawings below sketch a fuller frame and gearing. The bundle carries no transcription for these figures.