A. A tackle is a purchase formed by reeving a rope through one or more blocks for the purpose of hoisting or pulling.
Q. Name the parts of a block.
A. The shell, sheave, pin, and strap. (See Fig. 49.)
Q. Describe the following blocks: Single, double, treble, snatch, and tail.
A. Single blocks have one sheave; double, two; treble, three. A tail-block is a single block strapped with an eye-splice and having a long end by which to make the block fast temporarily. A snatch-block is a single block having a notch in one cheek to receive the bight of a fall. (See Fig. 49.)
Q. What are the standing parts, the running parts, and the fall?
A. The standing parts are between the fasts and sheaves, the running parts between the sheaves, and the fall the part held in hauling.
Q. Describe the whip.
A. A rope through a single block. (See Fig. 49.)