Fog-signals may be produced by sound[1]. A number of methods for producing sound have been used, including bells, gongs, guns, rockets, whistles and sirenes. Bells and gongs are struck to create sound; guns and rockets make a sound via explosions[1]. Whistles and sirens use steam or compressed air to produce continuous sound[1]. Distinctions in sound can be created through differing notes or patterns of sound production[1].
''Automatic meter for producing Intermittent Lights hythe flow oftheGas[1].''
''Crymhals forpreserving theVerticality ofBuoy Light
Apparatus[1].''
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