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Flow Festival 2017
Saturday, Lapin Kulta Red Arena
(c) Andrew Taylor, andrewtaylorphoto.com @taylorbenice
As you get further into Scapa Flow, more of the defences of this, Britain's greatest naval base in both the First and Second World Wars, become evident.
Historically, the main British naval bases were located near the English Channel to better face England's old enemies, France, Spain, and the Netherlands. In 1904, in response to the build-up of the German High Seas Fleet, it was decided that a northern base was needed to control the northern entrance to the North Sea. Rosyth on the Forth and the Cromarty Firth were looked at, but Scapa Flow was eventually chosen and the British Grand Fleet moved here as the Great War broke out, even though it was at the time, unfortified.
Two attempts were made by German U-boats to enter the anchorage during the Great War, both of which failed. U-18 tried to enter in November 1914, but a trawler searching for submarines rammed it, causing U-18 to flee and then sink. U-116 made the second attempt in October 1918 but was detected by hydrophones before entering the anchorage and then destroyed by shore-triggered mines.
Following Germany's defeat in 1918, 74 ships of the High Seas Fleet were interned in Scapa Flow pending a decision on their future under the terms of the peace treaty of Versailles. On 21 June 1919, after nine months of waiting, Rear Admiral Ludwig von Reuter, the German officer in command at Scapa Flow, made the decision to scuttle the fleet because the negotiation period for the treaty had lapsed with no word of a settlement (he was not kept informed that there had been a last-minute extension to finalise the details). The subsequent salvage of the scuttled German warships over the decades that followed is an epic story in itself.
Between the wars, the defences at Scapa Flow fell into disrepair, with the result that shortly after the outbreak of the Second World War, the German submarine U-47 was able to enter the anchorage and sink the WWI era battleship HMS Royal Oak. This event, combined with a German air raid a few days later, resulted in a rapid improvement in the defences! The Royal Oak is classified as a war grave and remains on the bottom of Scapa Flow.
Following WW2, Scapa Flow was closed as a naval base in 1956. Its chief claim to fame these days is the oil terminal on the island of Flotta.
Photo By Francesco Pagliaro
Data: 31/05/2009
Ora: 03:42:07
Otturatore: 1/8
Apertura: f/5,0
Lung.Focale: 20mm
Flash: Non attivo
Misurazione: Schema
Sensibilità ISO: 400
Modello: Canon Eos 800d
Lens: Canon EF-S 18-55mm f/3.5-5.6 IS
Flow of the main program. This flow contains the main tasks of the main. The basis is a tick time from 1ms via an interrupt routine. The required times are thus determined in multiples of 1 ms. Examples are the meter time of 200 ms, the shutter lag of 52 ms, etc. Only the Flash task is excecuted directly due to the short delays between 10 and a few 100 us. Flash power steps are 4 us resolution with a max of 1024 us for full power. Detail of the timings are on this picture:
www.flickr.com/photos/fotoopa_hs/6840451517/
During the software tests, every I/O pin from the Atmega328p controller is connected to the logic analyser, now 20 signal lines total. Any time relatrion between the signals can be seen.
Flow last update:
2012 Feb 15
All timing functions on logicanalyser are tested now. Corrected a few Flags and labels. The repaet mode is also tested and take an 3D picture every 278 ms if the detector send a detection signal ( near 4 pictures/sec) Higher is possible but I have limited this so even the wakeup sequence is correct from the first picture ( minimum 200ms wakeup if started from sleep mode). All lasers are disabled during shutter open time and IR lasers are only actieve if the record sequence is started (Start buttom actief) for security.
Flow Festival 2017
Saturday, Lapin Kulta Red Arena
(c) Andrew Taylor, andrewtaylorphoto.com @taylorbenice