Some cool metal components china images:
Thames Festival Finale Fireworks
Image by Dominic’s pics
Element of a Set / Virtual Firework Display Slideshow documenting the firework show that marked the end of the "the mayor’s" Thames Festival in London on the evening of Sunday September 11th 2011.
The display was presented by Pains Fireworks.
A delay in the start off of the show from the scheduled time was attributed by the crowds to incompetence by "Bumbling Boris" Johnson – the London Mayor – portion of the British patrician "limited liability" ruling class. "I’m in charge, but if anything goes incorrect, somebody else will be sacked…"
Like the intense audio dynamic range of Taiko or Samba drumming, it is not really feasible to record the visual brilliance of fireworks with a camera. You have to knowledge firework displays reside, in individual. These photos have been taken at the slowest sensor speed (ISO 100), maximum aperture (to minimise diffraction "glare" effects) and with a variety of exposure times ranging from about .five to two seconds. The intense light brought on some "bleaching" of the paths of the lights, and so the colours have been enriched if Photoshop. (In retrospect I may possibly have utilised a slightly smaller sized aperture.)Additionally, the river and land areas have been selectively lightened in Photoshop. Fortuitously, a gentle breeze caused the smoke to drift eastwards, away from my vantage point on Waterloo Bridge, so the view of the fireworks was comparatively unobstructed by smoke.
Fireworks date from at least the 7th century in China. The colours are believed to have been conventional incandescent "black body" bonfire colours: red, orange, yellow and white. (It is theoretically feasible to create pale blue just by heating, but this demands impracticably higher temperatures. It is not achievable to heat one thing to "green hot" or "purple hot".) It is believed that from about 1830 in Italy metal salts have been introduced to make a wider, richer hued, spectrum of colours by chemical luminescence. This strategy can be problematic, as it can be tough to develop stable, sensible, chemical compositions. It has been recommended that some shades of green are still challenging to accomplish.
See also:
Fireworks [Wikipedia]
Firework Colours [The chemistry of Fireworks by Reema Gondhia, Imperial College]
History of fireworks [Pyro Universe]