Nozzle on a Sphere
A round nozzle on a sphere made in zones, radial or upright: the nozzle unrolled with its cut, and the zone it stands on with the hole marked. A round nozzle set onto a sphere made in zones, square to its surface or upright: the nozzle unrolled with its saddle cut, and the zone it stands on with its hole marked.
How the nozzle on a sphere is developed, with a worked example · Pipe ends and nozzles