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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
A pre- engineering base line was run down a very steep hill.rather than measure horizontaily down hill with steel tape: surveyor measured the vertical angle with the theodolite and
what is barometric leveling
Define the Predominant factor in atmospheric corrosion? The predominant factor in atmospheric corrosion in areas located above splash zone is moisture as there is an excess ava
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Q. What is Switch and Expansion Joint? Switch Expansion, Joint (SEJ) is an expansion joint installed at each end of LWR/CWR to permit expansion/contraction of the adjoining bre
Low Cost Roads Connecting Villages: Problem of Village Connectivity It is estimated that nearly 45 per cent of India's villages are not connected by an all-weather ro
TIMBER Timber refers to wood utilized for construction works. Actually the word timber is derived from an old English word 'Timbrian' that means 'to build'. A tree that yields
Q. How to determine the frequency of flood? Flood frequency may be estimated preferably from flood records, if available, for a number of years or they may be based on rainfall
Compass Surveying: You have studied about the compass and its use for bearings of measuring survey lines. The angular measurements are carried out with prismatic compass that
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