“…3,4) In this paper, discussion will be made on the importance of falling trajectory control in achieving stability of burden distribution control under high ore to coke ratio operation with the intensive coal injection in bell-less top charging, development of falling trajectory measuring technique that enables the control, and the results of applying the technique to actual furnace from the viewpoint of relation between changes of various phenomena of burden distribution formation and its controllability, and it is our sincere hope that the paper would contribute to further improvement of operational flexibility. 1) and Nobuyuki NAGAI 2) R & D Lab., Kobe Steel, Ltd., Ikeda, Onoe-cho, Kakogawa, Hyogo 675-0023 Japan. 1) Kobe Works, Kobe Steel, Ltd., Nadahama-higashimachi, Nada-ku, Kobe, Hyogo 657-0863 Japan.…”