Image: Halliburton. Downhole camera technology puts eyes underground, enhancing a company's understanding of what is going on within the furthest depths of production and helping operators make important decisions that benefit from the all too valuable sense of sight.
Barium was discovered by Sir Humphrey Davy at 1808 in England. Origin of name: from the Greek word barys meaning heavy Baryta (barium oxide, BaO) was distinguished from lime (calcium oxide, CaO) by Scheele in 1774.
He called them corpuscles, we know them as electrons. He made the Plum Pudding Model of an atom in which the electrons were stuck randomly in a chunk of positively charged matter, like plums in pudding. Rutherford-1909-1911-Shot atoms at gold foil and discovered atoms are mostly empty space.