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
Pierre Edmond Teisserenc de Bort Pierre Edmond Teisserenc de Bort Pierre Edmond Teisserenc de Bort (17 September 1814 at Châteauroux – 29 July 1892 in Paris), was a French writer and politician. He entered the civil service after the completion of his education at the École Polytechnique. He was a railway expert, becoming secretary-general of the Railway Commission established in 1842, government commissioner to the authorized railway companies, administrator of the Lyon-Mediterranean railway, and commissioner to examine foreign railways. In 1846 he was returned to the Chamber of Deputies for Hérault, but the revolution of 1848 drove him into private life, from which he only