(d.) Provided also that in cases where a yard-arm of fibre rope is
used for dumping, the size of the rope shall not be less than 3½in. in
circumference.

(e.) And provided further that in cases where extra-heavy single-piece
goods, such as, for instance, motor-cars in cases, large pieces of machinery,
&c., which exceed in weight 1 ton 2 cwt. 6 lb. (the safe-working load for a
3½-in. endless-fibre-rope sling) are to be lifted by a fibre-rope yardarm, a
double yardarm shall be rove off, and the rope shall not be less in circum-
ference than 3½ in.

(f.) Provisoes (b) and (c) shall not apply to Harbour Board or wharf
cranes.

12. Rings, long links, shackles, swivels, and hooks shall be equal in
    strength to the chains, ropes, or slings to which they are attached.
    Dimensions for rings are given in the Tables Nos. 24 and 25 and in Diagram
    No. 15. Rings for chains and ropes may be of the dimensions indicated in
    the tables and diagrams for the various sizes of chains and ropes; but
    where chains or ropes have rings of other proportions attached to them the
    rings shall be at least of equal strength to the rings specified in the tables
    and diagrams for the particular size of chain. The strength of a ring shall
    be assumed to vary directly as the cube of the diameter of the iron of the
    ring, and inversely as the mean diameter of the ring.

13. Chain which has been worn so that the wear at any part exceeds
    ⅛ in. on chains up to ½ in. diameter, ⅝ in. for ⅝ in. chain, and ¼ in. for
    every ⅛ in. increase in diameter up to 2 in., must not be used until the worn
    parts have been renewed.

14. The working-load on long-link chain shall not exceed two-thirds of
    the working-load for short-link chain of the same diameter.

Swivels for chains shall be proportioned as follows : The diameter of
the iron in the common link being regarded as unity, the diameter of the
iron in the size of the swivel must be at least 1¼; the diameter of the iron
in the pin at the bottom of the thread must be 1⅜; the diameter of the
iron in the crown of the bow-piece must be 1½; the depth of the bow-piece
where bearing on the swivel-nut must be 1⅜; the depth of the nut of the
swivel-pin must be 1⅜. The swivel-pin should be screwed to the Whit-
worth standard, and have the end riveted over or secured thereto by welding
it to the end of the pin.

Provided that shipowners’ existing stocks of swivels may be used up so
long as they are approved by an Inspector of Cargo Gear or Surveyor of
Ships.

Provided further that swivels made of special steel which do not conform
to the above-mentioned proportions may be used if approved by the Chief
Surveyor of Ships.

Shackles shall be made of iron not less than 1·3 times the diameter of
the iron of the links of the chain to which they are attached. The
diameter of a shackle-pin shall not be less than the diameter of the iron of
the shackle when the width of the gap is not greater than the diameter of
the iron of the shackle and not less than 1·2 times the diameter of the iron
of the shackle when the width of the gap is greater than the diameter of
the iron of the shackle, but not greater than 1·8 times the diameter of the
iron of the shackle. All shackle-pins must be screwed in or otherwise
properly secured. Shackles attached to more than one chain must be
proportioned to a chain equal in strength to all the chains attached to the
shackle.