Dished head development
The spherical head in gores and the nozzle set into it. A sphere is not developable: the gore template is the shop layout, exact in area, and the part is formed.
Sphere Gore (Dished Head Petal)
One gore of a spherical head. A sphere is not developable, so this is the shop layout: true length on the meridian, half-width from the parallel.
Nozzle on a Spherical Head
The upright nozzle on a formed head, its axis offset by v. The pattern is exact — the nozzle is a cylinder, and cylinders develop. The head does not.