Helicoid, Helicoidal

Spirally curved or involuted. Helicoid Parabola . ( Math .) See PARABOLIC SPIRAL. Helicom'etry, n. [Gr. helikos , a spiral, and metron , measure.] (Geom.) The art of measuring spiral lines on a plane. Hel'icon, a mountain of Bœotia, between Lake Copais and the Corinthian Gulf. It was celebrated by ancient poets as the favorite seat of the Muses. The loftiest summit (now called Paleovúvi ) is about 5,000 feet high. At the bottom of H. stood the village of Askra, the residence of Hesiod, and the seat of the earliest school of poetry in Greece. In ascending the mountain from Askra (now Pyrgáki ), the traveller pa es the famous fountain of Aganippe, the waters of which were fabled to bestow inspiration. The Grove of the Muses is supposed to have been situated in a hollow at the foot of Mount Mirandáli, one of the summits of Helicon. Twenty stadia above this was the fountain of Hippocrene, probably the modern Makarioti a, where there is still a fine spring. Helico/nian, a . Relating, or pertaining to Helicon. He'liers, (St.,) a fortified seaport-town, and cap. of the island of Jersey, in the English Channel, 90 m. S. of Portland Bill, Eng., and 39 N.W. of St. Malo, on the French coast. The town stands on St. Aubin's Bay, on a slope between two rocky heights, and is tolerably well-built. Manuf . Unimportant. Pop . 32,480.