(2)(a)Every jib-crane so constructed that the safe working load may be verified by the raising or lowering of the jib shall have attached thereto either an automatic indicator of safe working loads or an automatic jib angle indicator and a table indicating the safe working loads at corresponding inclinations of the jib or corresponding radii of the load.(b)A table showing the safe working loads of every kind and size of chain, rope, or lifting tackle in use, and in the case of multiple sling, the safe working loads at different angles of the legs, shall be posted in the store room or place where or in which the chains, ropes or lifting tackles are kept, and in prominent position on the premises and no rope, chain or lifting tackle not shown in the table shall be used:Provided that the foregoing provisions of this clause shall not apply in respect of such lifting tackle if the safe working load thereof, or in the case of a multiple sling, the safe working load at different angles of the legs, is plainly marked upon it.
