562

NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

(6) All chains, other than bridle chains attached to derricks or
masts, and all rings, hooks, shackles- and swivels used in hoisting
or lowering shall, unless they have been subjected to such other
treatment as may be prescribed, be effectually annealed under the
supervision of a competent person and at the following intervals :—

Fig. 5.
A netboard for lifting small cased goods up to a
weight of 25 cwt.
(L) half inch and smaller chains, rings, hooks, shackles and
swivels in general use, once at least in every six months;
(ii.) all other chains, rings, hooks, shackles and swivels ID
general use once at least in every twelve months,
(a,) No rope shall be used in hoisting or lowering unless—
' (i.) it is of suitable Duality and free from patent defect, and