Shearpole

He then excavated under the upper edge as much as possible, so that the escaping air passed through and loosened up the material on that side, wedged up and strained the pipe as before, and, with a battering-ram made of a 12-in. square oak timber, 12 ft. long, and in the middle suspended from shearpoles, struck successive blows against the top of the pile; while it was desceending; it was thus quickly brought into position.

Source: wiktionary

The best example of these devices that I know of in Aberdeen is at the shearpoles, where the worm and wheel are used for the hoisting motion, the screw and nut for the derricking.

Source: wiktionary

The shearpole tradition is so strong that even in some national forests where regulations specifically prohibit cutting live trees, the rangers look the other way when they see freshly chopped shear poles supporting a tent.

Source: wiktionary

so careful were our officers to keep the rattlins taught and straight, that we were obliged to go aloft upon the ropes and shearpoles with which the rigging was swifted in; and these were used as jury rattlins until we got close upon the coast

Source: wiktionary