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permissory signal, and with either pilot or full instructions as to the passage to be taken through the mine fields. All such ships coming from the West will enter by the Sulphur Channel.
4. The permissory signal will consist of flags by day and coloured lamps by night, to be altered from day to day.
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Any Steam Vessels or Ships attempting to pass the lines above indicated without shewing the permissory Signal will be first warned by firing a shot across the bows. If this is insufficient she is to be
1974