Jibhead

An improvement over the arcwaller, this machine is designed for giving a shear cut in any plane in addition to the horizontal cut, with a view to reduce the amount of blasting and to get better size-consist of the broken coal. It is used for rapid advance of headings. It has four units: a gearhead, a motor housing, a main jibhead, and an eccentric jibhead. The cutting head is mounted eccentrically on the main jibhead and the two are capable of complete rotational movement independently or […]

Source: wiktionary

For instance there can be no disputes nor discourses about the superiority of the jibhead sail plan with its permanent backstay over the old fashioned gaff-head main sail.

Source: wiktionary

‘[…]Every jibhead from here to Timbuktu’s gonna want a taste.’

Source: wiktionary