Instructables user [rog8811] was looking to build a fog horn that resembled hand ... He used a simple double-acting air pump to drive the horn, combining it with a slightly modified bottle trap.

Instructables user [rog8811] was looking to build a fog horn that resembled hand ... He used a simple double-acting air pump to drive the horn, combining it with a slightly modified bottle trap.

Blaring fog horns alert mariners of poor visibility and ... foggy west side and the warmer, sunnier east side. Air rising along Twin Peaks accelerates and cools, keeping the western side of ...