shearpole

A horizontal crosspiece.

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.

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.

A horizontal crosspiece.

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

On the greasy deck of a whaling vessel, piled as high as the main shearpole with immense slabs of blubber sizzling in the heat of a tropic sun, the task is peculiarly disagreeable.

A horizontal crosspiece.

The last chapter consists of a glossary of 5,000 technical terms restricted to those used by workmen and others on bridge designing, construction and erection (not, however, including bobtail swing spans or shearpole draws); this covers 221 pages, and the book concludes with an index filling 61 pages.

In the late eighties and early nineties several new types of movable spans were advocated, including the pull-back draw, the jackknife span, the bob-tail swing, the horizontal-folding draw, the shearpole draw, the gyratory lift, the transbordeur, the double-cantilever swing, several types of bascule, and the vertical lift.