(f)between the north of Budge Budge and the Premchand Jute Mill, near the right bank of the River and the edge of Budge Budge Sand: Provided that between Fort Gloster Flat Buoy and the Lothian Jute Mill no inland steam-vessel other than a stern wheeler, launch, tug or ferry steamer which has no other craft in tow shall navigate the channel when sea-going vessels are turning or about to turn on either the flood or ebb tide;
