Diagram A: the lever action of lamms in relation to a shaft and a treadle. Two long rectangles with labels. Both have an unlabelled red circle on one end (this is likely intended to indicate where the lamm is attached). Both rectangles have an arrow pointing to the horizontal center of the rectangle labelled “Shaft cord.” The top diagram is labeled “This Lamm is a Class 3 Lever” and has a second arrow pointing to a spot about 3/5 of the way between the red circle and the Shaft Cord. This spot is labelled “Treadle cord.” The bottom diagram is labelled “This Lamm is a Class 2 Lever” and has a second arrow pointing to a spot about 2/5 of the way between the center point marked “Shaft cord” and the end of the rectangle that does not have a red circle.