Underrunner

FOR SALE AT A BARGAIN. […] Four run stones, Munson underrunners, 3 ft diameter.

The arrangement is preferably applied to an underrunner mill.

Less than half a mile to the south the party sighted an underrunner of a sledge, and assumed it to mark the location the Norwegians had assigned for 90°S.

A triple tandem tow using underrunners. This method has been used for long ocean tows by tugs with a single-drum winch.