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.
Discovery: Swiss chemists Marc Delafontaine and Jacques-Louis Soret documented the special absorption bands of holmium in 1878, declaring it Element X.. Per Teodor Cleve later independently discovered the element while working on erbia earth, and the element is named after his native city.