"1. A horn used on board a vessel to sound a warning signal to other vessels in foggy weather. 2. A sounding instrument for warning vessels off shore during a fog. The most powerful of these instruments is the siren, or siren fog-horn." -Whitney, 1911

Brown's Siren Foghorn

"1. A horn used on board a vessel to sound a warning signal to other vessels in foggy weather. 2. A…