TACKLE, … a machine formed by the communication of a rope with an assemblage of blocks, and known in mechanics by the name of pulley.

Tackles are used in a ship to raise, remove, or secure weighty bodies; to support the masts; or to extend the sails and rigging.

TAIL-BLOCK, a small single block, having a short piece of rope attached to it, by which it may be fastened to any object at pleasure; either for convenience, or to increase the force applied to the said object, as explained in the first part of the article tackle.

– Wm. Falconer’s Dictionary of the Marine (1780).