Porro Bluff [SEP] continent
Porro Bluff
Porro Bluff () is a bluff lying south of Birdsend Bluff and overlooking Errera Channel on the Danco Coast, western Graham Land, Antarctica. Shown on an Argentine government chart of 1950. Named by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1960 for Ignazio Porro (1795–1875), Italian engineer who in 1851 invented a prism combination, important in the development of stereo-plotting instruments.
Orel Ice Fringe
Orel Ice Fringe () is a strip of coastal ice bordering the south side of Errera Channel between Beneden Head and Porro Bluff, on the west coast of Graham Land. Mapped by the Falkland Islands Dependencies Survey (FIDS) from photos taken by Hunting Aerosurveys Ltd. in 1956-57. Named by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1960 for Eduard von Orel (1877–1941), Austrian surveyor who in 1905 designed the first stereoautograph for plotting maps directly from horizontal photographs