Boart Longyear samples for the proposed Golden Gate Bridge in San Francisco. In spite of the financial crisis, the 1930s saw improvements in diamond drilling technology, including the use of industrial-quality diamonds mined in Africa that were called “boarts.” In 1936, South Africa’s Anglo American Corporation formed Boart Products South Africa (Pty) Limited, which was later named Boart International. The new company developed the first mechanically-set diamond core bits, which were less expensive than the hand-set core bits that used more expensive Brazilian diamonds (carbonados). Longyear’s business gradually improved in the 1940s in response to expanding worldwide mineral exploration. In 1949, the
What the Industrial Revolution Did for Us idea and inventions of the Industrial Revolution that created the features of modern transportation. Cruickshank travels around Britain to introduce the idea and inventions of the Industrial Revolution that created the features of modern medicine. Cruickshank travels around Britain to introduce the idea and inventions of the Industrial Revolution that created the features of modern warfare. Cruickshank travels around Britain to introduce the idea and inventions of the Industrial Revolution that created the features of modern city life. What the Industrial Revolution Did for Us What the Industrial Revolution Did for Us is a BBC documentary series produced in conjunction