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Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension .
Toughened glass was invented in 1874 by Francois Barthelemy Alfred Royer de la Bastie. [1] Wire mesh glass was invented in 1892 by Frank Shuman. [2] [3] Laminated glass was invented in 1903 by the French chemist Édouard Bénédictus (1878–1930). [4] These three approaches can easily be combined, allowing for the creation of glass that is at ...
In 1978 Jayewardene introduced a new constitution making Sri Lanka a presidential 'Democratic Socialist' republic, with himself as executive President The Constitution of Sri Lanka: Chapter I – The People, the State and Sovereignty. In 1980 he crushed a general strike by the trade-union movement, jailing its leaders.
The history of Sri Lanka covers Sri Lanka and the history of the Indian subcontinent and its surrounding regions of South Asia, Southeast Asia and the Indian Ocean. Prehistoric Sri Lanka goes back 125,000 years and possibly even as far back as 500,000 years. [1] The earliest humans found in Sri Lanka date to Prehistoric times about 35,000 years ...
In 1972, the country was renamed as the Free, Sovereign and Independent Republic of Sri Lanka, and the position was known as the prime minister of Sri Lanka from then onwards. The prime minister also held the unified Ministry of External Affairs and Defence until 1977, when the government of J. R. Jayewardene split the ministry into two ...
The president of Sri Lanka is the elected head of state and the chief executive of Sri Lanka. The president is a dominant political figure in the country. The office was created in 1972, as more of a ceremonial position. It was empowered with executive powers by the 1978 Constitution introduced by J. R. Jayewardene.
The head of state of Sri Lanka is the president. The office has existed since 1972 with the establishment of a Republican government under the 1972 Constitution . However for most of its history, from 543 BC the head of state has been a monarch.
1971 JVP insurrection: Marxist insurrection conducted by the Janatha Vimukthi Peramuna against the government of Sri Lanka. 1972: Sri Lanka becomes a republic, and country's name Ceylon is changed to Sri Lanka: 1983 24–30 July Black July by the government and Sinhalese mobs; Beginning of the Sri Lankan Civil War: 1987 29 July Signing of the ...