Wheel driving an axle in and out through a slot
Two framed mechanisms in which the turning of wheel m drives an axle in and out through the hole n
Two perspective mechanisms convert the rotation of a wheel into the back-and-forth travel of a horizontal axle. The note explains that the axle's office of entering and exiting through the hole n follows the turning of wheel m, and that the very same reciprocating action can equally be produced at m, from the opposite side. The whole page is devoted to machine elements of the kind that recur throughout this treatise on mechanics.
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Axle driven in and out by wheel m through the hole n
The axle performs its office of entering and exiting through the hole n according as the turning of the wheel m guides it. Leonardo notes that the identical reciprocating action can be obtained at m, from the opposite side of the frame. Two framed arrangements illustrate the drive.