Machine casing and the wheel of the first motion
Proportions for a bored case and a driving wheel to be built in two lengthwise pieces
A sparse sheet drawn largely in red chalk, with two large oval forms flanking a central pivot fitted with radiating arms and a fainter device at the upper left. The single note gives building instructions for a machine: a bored case proportioned two-thirds long, one-sixth wide and one-third high; a thread a b to be lengthened as far as m b; and the wheel of the first motion to be made in two pieces along its length.
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Case dimensions and the two-piece driving wheel
The note proportions a bored case at two-thirds long, one-sixth wide and one-third high, and directs that the thread a b be extended as far as m b. The wheel of the first motion is to be built in two pieces along its length.
Oval drums and central rotor in red chalk
Two large oval forms in red chalk stand to either side of a central pivot bearing radiating arms, sketching the mechanism the note describes. A smaller device appears faintly at the upper left.