(2)(a)Every jib-crane, which is so constructed that die safe working load varies with 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 the 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 a multiple sling, die safe working loads at different angles of-the legs, shall be posted in the storeroom or place where, or in which, the chains, ropes or lifting tackles are kept, and in prominent positions on the premises; and no rope, chain or lifting tackle, not shown in the table, shall be used. However, the foregoing provisions of this paragraph shall not apply in respect of such lifting tackle in the safe working load thereof, or in the case of a multiple sling, safe working load at different angles of the legs, is plainly marked upon it.
