Annex III (2) - Bell or Gong
Overview
Annex III (2) provides the technical details of bells and gongs.
Annex III (2) - Bell or Gong
Intensity of signal
A bell or gong, or other device having similar sound characteristics shall produce a sound pressure level of not less than 110 dB at a distance of 1 metre from it.
Construction
Bells and gongs shall be made of corrosion-resistant material and designed to give a clear tone. The diameter of the mouth of the bell shall be not less than 300 mm for vessels of 20 metres or more in length. Where practicable, a power-driven bell striker is recommended to ensure constant force but manual operation shall be possible. The mass of the striker shall be not less than 3 per cent of the mass of the bell.
About This Work
No visual explanation of this rule was produced within the original series, but the text is included here for completeness within the COLREGs in Depth collection.
A dedicated visual explanation can be produced for this rule upon request.
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