perhaps it's a typo for 'auger':

http://www.bartleby.com/61/95/A0519500.html

1a. Any of various hand tools, typically having a threaded shank and cross handle, used for boring holes in wood or ice. b. A drill bit. 2a. A machine having a rotating helical shaft for boring into the earth. b. A rotating helical shaft used to convey material, as in a snow blower.

Siehe Wörterbuch: auger
Schreibfehler.

Danke, offensichtlicher Druckfehler, so macht´s Sinn.