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Home > All Images > 2003 > August > 8 Aug 2003

Images Dated 8th August 2003

Choose from 36 pictures in our Images Dated 8th August 2003 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Techncian welds with an oxyacetylene torch Featured 8 Aug 2003 Print

Techncian welds with an oxyacetylene torch

Welding. Technician in protective clothing welds a section of an oil and gas pipeline with an oxyacetylene torch. Welding involves heating two pieces of metal so that they melt and fuse together. Oxyacetylene torches use a mixture of oxygen and acetylene to create the heat needed to melt the metal. The acetylene burns in oxygen to form carbon monoxide; this reaction provides most of the heat. The carbon monoxide then reacts with atmospheric oxygen to give the blue flame. The flame from an oxyacetylene torch is "neutral", meaning that it burns without leaving oxides in the cut region. Photographed during work on the Urengol-Ushgorod pipeline in Russia

© RIA NOVOSTI/SCIENCE PHOTO LIBRARY

Daniell cell battery Featured 8 Aug 2003 Print

Daniell cell battery

Daniell cell. Invented by the British chemist John Frederic Daniell (1790-1845), the Daniell cell (left) is made from two half-cells, the electrolytes of which are separated by a porous partition. The positive electrode is copper immersed in copper sulphate solution, the negative electrode is zinc immersed in dilute sulphuric acid. Zinc ions migrate across the porous partition, continuously forming zinc sulphate, while copper is plated out onto the copper electrode. It is the movement of ions which creates the electrical current of about 1.1 volts, which can be measured with a voltmeter (right)

© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY