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Schlumberger Conrad (b. 1878-10-02 / d. 1936-05-09)
In 1912, Conrad conceived the revolutionary idea of using electrical measurements to map subsurface rock bodies in order to acquire information about the nature of the rock (chalk, sandstone, granite,etc.) and the presence of hydrocarbons. In 1919, Marcel began working with his brother and in 1920 they opened their first office in Paris. In 1927, the Schlumberger brothers produced the first measurements (Electric Log) of an oil well in France. These ideas were very successful, and they founded the Société de Prospection Électrique in 1926 and Schlumberger Well Surveying Corporation (now Schlumberger Well Services) in 1934.
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74
Born 1942-05-03. Domain:Sport. Cause of death:cancer (pancreas)
She was a Czechoslovak artistic gymnast and Czech sports official. She won a total of 22 international titles between 1959 and 1968 including seven Olympic gold medals, four world titles and eleven European championships. Čáslavská is the most decorated Czech gymnast in history and is one of only two female gymnasts, along with Soviet Larisa Latynina, to win the all-around gold medal at two consecutive Olympics. Čáslavská was diagnosed with pancreatic cancer in 2015.