Bosuns Whistle life raft launching barometers in the past were barometers in the past were used at sea primarily to learn if the pressure was going up or down and wildlife you'll meet along the way A Bosun's Whistle or Boatswain's Call like this was an instrument used to give commands to the crew when voices could not be heard over the sounds of the sea These are still used in the Navy all around the world
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