The foghorn at Sumburgh in the Shetland Islands of Scotland is powered by more than one 44hp Kelvin K-Series diesel engines, powering the Alley and MacLellan compressors which blow the horn itself.

"Just so's you know," writes JJ Jamieson, who posted this footage to YouTube, "the horn was originally much louder at the end, but YouTube's audio algorithm turned the volume down. I tried several versions but it wasn't having it." Read the rest

Scientists have been experimenting with "fog harps" in arid climates as an easy way to collect potable water from fog.

Via the paper:

Fog harvesting is a useful technique for obtaining fresh water in arid climates. The wire meshes currently utilized for fog harvesting suffer from dual constraints: coarse meshes cannot efficiently capture microscopic fog droplets, whereas fine meshes suffer from clogging issues. Here, we design and fabricate fog harvesters comprising an array of vertical wires, which we call “fog harps”. Under controlled laboratory conditions, the fog-harvesting rates for fog harps with three different wire diameters were compared to conventional meshes of equivalent dimensions. As expected for the mesh structures, the mid-sized wires exhibited the largest fog collection rate, with a drop-off in performance for the fine or coarse meshes. In contrast, the fog-harvesting rate continually increased with decreasing wire diameter for the fog harps due to efficient droplet shedding that prevented clogging. This resulted in a 3-fold enhancement in the fog-harvesting rate for the harp design compared to an equivalent mesh.

• Harvesting water from fog with harps (YouTube / American Chemical Society) Read the rest

Earlier this year, Tate Modern's Switch House extension included a wonderful installation of fog art by Fujiko Nakaya. Read the rest

When the fog rolls into Dubai, photographer Daniel Cheong races to the nearest skyscraper to capture some remarkable photos. Day or night, the effect is otherworldly. Read the rest

Landscape photographer Melvin Nicholson captured this stunning shot of a ghost rainbow, aka white rainbow or fog bow, in Rannoch Moor north of Glasgow, Scotland.

Like rainbows, fogbows are caused by sunglight reflecting off water drops. However, as NASA explains:

The fog itself is not confined to an arch -- the fog is mostly transparent but relatively uniform.The fogbow shape is created by those drops with the best angle to divert sunlight to the observer. The fogbow's relative lack of colors are caused by the relatively smaller water drops. The drops active above are so small that the quantum mechanical wavelength of light becomes important and smears out colors that would be created by larger rainbow water drops acting like small prisms reflecting sunlight.