Tuesday, 23 May 2017

DESKTOP 1393 - WHITE CLIFFS OF DOVER

The White Cliffs of Dover are cliffs that form part of the English coastline facing the Strait of Dover and France. The cliffs are part of the North Downs formation. The cliff face, which reaches up to 110 m, owes its striking appearance to its composition of chalk accented by streaks of black flint. The cliffs stretch along the coastline for 13 km, spreading east and west from the town of Dover in the county of Kent, an ancient and still important English port.

The cliffs have great symbolic value in Britain because they face towards continental Europe across the narrowest part of the English Channel, where invasions have historically threatened and against which the cliffs form a symbolic guard. The National Trust calls the cliffs "an icon of Britain", with "the white chalk face a symbol of home and war time defence." Because crossing at Dover was the primary route to the continent before the advent of air travel, the white line of cliffs also formed the first or last sight of Britain for travellers. In World War II, thousands of allied troops on the little ships in the Dunkirk evacuation saw the welcoming sight of the cliffs.

This post is part of the  Our World Tuesday meme,
and also part of the Ruby Tuesday meme,
and also part of the Travel Tuesday meme,
and also part of the Wordless Wednesday meme.


And one cannot forget the classic Vera Lynn song in this context:

Sunday, 21 May 2017

DESKTOP 1391 - CD SURFACE

You are looking at the surface of a music CD magnified about 400 times, a photomicrograph I took with a laser reflecting microscope.

The surface of a CD is made of a polycarbonate layer with moulded spiral tracks on the top. The data are stored on the CD as a series of minute grooves which are known as ‘pits’ encoded on these spiral tracks. The areas between the ‘pits’ are known as ‘lands’. In the photo, the ‘lands’ are the dark blue-black colour and the ‘pits’ are the various lighter colours, with red representing the deepest area of the ‘pits’.

These pits and lands do not represent the 1s and 0s, rather each change from pit to land or land to pit is interpreted as 0 while no change is read as 1. When you play the CD, the Read Laser bounces the light beams (not capable to modify the surface of CD) on the surface and detects the pits and lands. Each change between pit to land or vice versa is translated as zero and no change (pit to pit or land to land) is translated as one. These binary values form the actual data.

In case you are wondering, the CD is Beethoven's Symphony No 5 in C minor, op 67...

This post is part of the My Sunday Best meme,
and also part of the My Sunday Photo meme,
and also part of the Photo Sunday meme.

Thursday, 18 May 2017

DESKTOP 1388 - MONTBRETIA

Montbretias belong in the the Iridaceae family of bulbs, the Crocosmias having originated in Southern Africa. Montbretia is a hardy member of the Crocosmia group and is very easy to grow. Crocosmia × crocosmiiflora (Montbretia) is a garden hybrid of C. aurea and C. pottsii, first bred by Victor Lemoine in 1880. The variety illustrated here is ‘His Majesty’.

The orange flowers are trumpet shaped and appear alternately along the stems. The leaves are long and narrow.This is one of the few summer flowers in our garden that make a pretty display and can grow wildly. Some people call this a "wild gladiolus", but the wild gladiolus is pinkish in colour.

This post is part of the Floral Friday Fotos meme,
and also part of the Weekend Green meme,
and also part of the Orange you Glad It's Friday meme.

Tuesday, 16 May 2017

DESKTOP 1386 - BRISBANE, AUSTRALIA

Brisbane is the capital and most populous city in the Australian state of Queensland, and the third most populous city in Australia. Brisbane's metropolitan area has a population of 2.24 million, and the South East Queensland urban conurbation, centred on Brisbane, encompasses a population of more than 3 million.

The Brisbane central business district stands on the original European settlement and is situated inside a bend of the Brisbane River, approximately 15 kilometres from its mouth at Moreton Bay. The metropolitan area extends in all directions along the floodplain of the Brisbane River valley between Moreton Bay and the Great Dividing Range. The metropolitan area sprawls across several of Australia's most populous local government areas, including the City of Brisbane, which is by far the most populous LGA in the nation.

The demonym of Brisbane is Brisbanite. Brisbane is named after the Brisbane River on which it is located, which in turn was named after Scotsman Sir Thomas Brisbane, the Governor of New South Wales from 1821 to 1825. The first European settlement in Queensland was a penal colony at Redcliffe, 28 kilometres north of the central business district, which was founded in 1824. That settlement was soon abandoned and moved to North Quay in 1825. Free settlers were permitted from 1842. Brisbane was chosen as the capital when Queensland was proclaimed a separate colony from New South Wales in 1859.

This post is part of the Our World Tuesday meme,
and also part of the Ruby Tuesday meme,
and also part of the Travel Tuesday meme,
and also part of the Wordless Wednesday meme.