Arnold Orville Beckman

 

Arnold Orville Beckman was born on April 10, 1900. He was an American chemist who invented a pH meter (1934) for measuring acidity and alkalinity and the quartz spectrophotometer, an instrument which pioneered automatic chemical analysis. He died on May 18, 2004.

Constitution of Pakistan created

The Constitution of the Islamic Republic of Pakistan is the supreme law of the State of Pakistan. Drafted by the government of Zulfikar Ali Bhutto, with an additionally assistance from the country's opposition parties, it was approved by the legislative assembly on April 10 and ratified on 14 August 1973.