Monday, 4 March 2013

DED




Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native populations of elms which had not had the opportunity to evolve resistance to the disease. The name "Dutch elm disease" refers to its identification in 1921 and later in the Netherlands by Dutch phytopathologists Bea Schwarz and Christine Buisman who both worked with Professor Westerdijk

Tuesday, 12 February 2013

Beachy Head Lighthouse - Winter





The Beachy Head lighthouse  became operational in October 1902. For more than 80 years, the red-and-white striped tower was manned by three lighthouse keepers. Their job was to maintain the light, which rotates, making two white flashes every 20 seconds. It was then visible 26 miles (42 km) out to sea. The lighthouse was fully automated in 1983 and the keepers withdrawn.
In June 2010, Trinity House announced in the five yearly "Aids To Navigation Review" that the light range would be reduced to 8 nmi (15 km) and the fog signal discontinued. In February 2011, the work was undertaken and light range reduced by the installation of a new LED navigation light system. The fog signal was discontinued at this time.
In 2011 Trinity House announced that it could no longer afford to repaint the distinctive red and white stripes and that it would have to be left to return to its natural granite grey. It stated that because boats now have high tech navigational systems the day marker stripes are no longer essential. However, a sponsored campaign to keep the stripes was launched in October 2011. The required £27,000 was raised, and the tower will be repainted in the spring of 2013.
http://en.wikipedia.org/wiki/Beachy_Head#Lighthouses