What are the four correct positions of the hand for using the boatswain pipe?

The correct positions of the hand for using the boatswain pipe are essential for ensuring proper manipulation and producing clear, effective sounds necessary for communication on board. The four specified positions – open, curved, closed, and clinched – allow a boatswain's mate to control the pipe's airflow and sound production accurately.

1. Open position allows for airflow and is used to produce a clear and resonant tone.

2. Curved position aids in directing the sound, helping to project it further while maintaining control over the pitch.

3. Closed position helps to stop the airflow effectively, creating distinct sounds that can signal different commands.

4. Clenched position ensures that the pipe stays secure and stable in the hand, allowing for consistent sound production, especially in dynamic environments where movement occurs.

These hand positions are fundamental techniques that ensure that the signals given by the boatswain's pipe are loud, clear, and distinct, making them easily recognizable by crew members.