Under London’s new Conservancy By-laws relating to every steam vessel, when the steam is up, and vessel is under way, shall in all cases of fog use as a signal a steam whistle, which shall be sounded at least every three minutes.
(a) Airships when under way shall in like manner use a fog horn. (b) When at anchor all vessels shall in like manner use a bell.
The penalty for breach of these by-laws is a sum not exceeding £5.