In the Macarthy roller gin, the lint, drawn by a roller covered with leather (preferably walrus hide), is drawn between a metal plate called the " doctor " (fixed tangentially to the roller and very close to it) and a blade called the " beater " or knife, which rapidly moves up and down immediately behind, and parallel to, the fixed plate.
Walrus tusks and walrus hides, which in the days of the old Norse settlements were the chief articles of export, are now of little importance.
But somewhat later they have probably met with the Eskimo farther north on the west coast in the neighbourhood of Disco Bay, where the Norsemen went to catch seals, walrus, &c. The Norse colonists penetrated on these fishing expeditions at least to 73° N., where a small runic stone from the 14th century has been found.
He alone was aware of the existence of the new throne of walrus ivory embellished with three silver life-size lions, and of the new regalia, both of which treasures he had, by the king's command, concealed in a vault beneath the royal castle.
Delphinopterus leucus, the sea-lion (Otaria Stelleri), and walrus abound off the coasts.
In Bering Sea and the Arctic Ocean, but are much less common than formerly, as are also the walrus, the sea otter and the fur seal.
The walrus is now found mainly far N.; the sea otter, once fairly common throughout the Aleutian district, is now rarely found even on the remoter islands; the fur seal, whose habitat is the Pribilof Islands in Bering Sea, ha .s been considerably reduced in numbers by pelagic hunting.
The walrus, hunted for its ivory tusks, and the sea otter, rarest and most valuable of Alaskan fur animals, are near extermination; the blue fox is now bred for its pelt on the Aleutians and the southern continental coast; the skins of the black and silver fox are extremely rare, and in general the whole fur industry is discouragingly decadent.