(2)(a)Every jib-crane so constructed that the safe working load may be varied 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 inclination of the jib or corresponding radii of the load.(b)A table showing the same working load 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 of lifting tackles are kept, and prominent positions on the premises and no rope, chain or lifting tackle not shown in the table shall be used.The foregoing provisions of this paragraph 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.
