Figure 4-21. Boatswain's chair with suspending tackle
PART C: HOISTING EQUIPMENT
You must know how to tie simple knots, use block and tackle, and operate hoisting equipment
efficiently and safely.
4-3. Knots and Hitches. Knots and hitches are used in many ways to tie equipment, materials,
scaffolds, and many other items to block and tackle in order to raise or lower items, as needed. Some of
the most commonly used knots and hitches are discussed below:
a. Square Knot. A square knot (Figure 4-22, page 4-18) is used to tie two ropes of equal size
together so they will not slip and are easily untied. Note that the square knot, the running end and
standing part of one rope come out on the same side of the bright that is formed by the other rope. The
square knot will not hold if the ropes are set or if they are of different sizes. It tightens under strain but
can be untied by grasping the ends of the two brights and pulling the knots apart.