
A fan descends from the top of the rim to the centre and closes into a triangle. A second fan opens from the centre toward the lower left, turning the figure away from the vertical axis. A band of concentric circles surrounds it. The plotter drew everything in pen; nothing is drawn by hand.
One of four Meridian drawings. All four are built on a circle of evenly spaced points: chords between the points form a star polygon, and fans of lines gather at points on the vertical axis.