In February 1897, the storm signals invented by Admiral Fitzroy in 1861 were introduced in Hong Kong with a minor modification, and the typhoon gun was fired when the drum was hoisted. The modified FitzRoy's storm warning system consisted of storm signals in the form of a cone or drum and night signals. A cone pointing upward (North Cone) was hoisted for warning of gales from the north or east while a cone pointing downwards (South Cone) warned of gales from the south or west. A drum was added to the cone when a strong gale which might reach hurricane force was expected. The night signal consisted of three lanterns with white or any colour but all alike, hung on a triangular frame, pointing upwards or downwards as the case might be. No lanterns were hoisted to represent the drum. In January 1898, at the suggestions of the Committee of the Chamber of Commerce, it was reverted to the system which had been in use in Hong Kong from 1884 to 1896 as the original system was considered to be better understood and interpreted by the boat and seafaring community.