Portree used Portree's pier as a rest point. The town also began exporting fish at this time, which contributed greatly to the local economy. The town had the last manual telephone exchange in the UK, which closed in 1976. Portree shale is a geologic association in the vicinity of Portree, the existence of which is linked with potential petroleum occurrences of commercial importance. Portree Portree (; , ) is the largest town on Skye in the Inner Hebrides of Scotland. It is the location for the only secondary school on the island, Portree High School. Public transport services are limited to
Principal bundle action of on is just right multiplication. The fibers are the left cosets of (in this case there is a distinguished fiber, the one containing the identity, which is naturally isomorphic to ). Consider the projection given by . This principal -bundle is the associated bundle of the Möbius strip. Besides the trivial bundle, this is the only principal -bundle over . Projective spaces provide some more interesting examples of principal bundles. Recall that the -sphere is a two-fold covering space of real projective space . The natural action of on gives it the structure of a principal -bundle over