Showing posts with label Sky. Show all posts
Showing posts with label Sky. Show all posts

Tuesday, April 8, 2008

Southwark Bridge

Southwark Bridge is an arch bridge for traffic linking Southwark and the City across the River Thames, in London, England. The bridge is sometimes nicknamed the "car park bridge" as coach drivers use it to park their vehicles.

Street Light



The first street in the world to be lit by electric light was Mosley Street, in Newcastle-upon-Tyne. The street was lit by Joseph Swan's incandescent lamp in February, 1879. Wabash, Indiana holds the title of being the second electrically-lit city in the world, which took place on February 2, 1880. Four 3,000 candlepower Brush arc lamps suspended over the courthouse rendered the town square "as light as midday." Kimberley, a city in the centre of South Africa, was the first city in Africa to have electric street lights - first lit on 1 September 1882. Timişoara, in present-day Romania, was the first city in mainland Europe to have electric public lighting on the 12th of November 1884. 731 lamps were used.

St Katharines Dock Dial - Sun Dial

This is a large equinoctial sundial in the form of a massive, 3.66 metres, stainless steel ring supported by three rigid chain link cables. The dial was designed by Wendy Taylor in 1973 and delineated by Christopher St J Daniels



The distinguishing characteristic of the equatorial dial (also called the equinoctial dial) is the planar surface that receives the shadow, which is exactly perpendicular to the gnomon's style.[8] This plane is called equatorial, because it is parallel to the equator of the Earth and of the celestial sphere. If the gnomon is fixed and aligned with the Earth's rotational axis, the sun's apparent rotation about the Earth casts a uniformly rotating sheet of shadow from the gnomon; this produces a uniformly rotating line of shadow on the equatorial plane. Since the sun rotates 360° in 24 hours, the hour-lines on an equatorial dial are all spaced 15° apart (360/24). The uniformity of their spacing makes this type of sundial easy to construct. Both sides of the equatorial dial must be marked, since the shadow will be cast from below in winter and from above in summer.
source : Wikipedia