Mårten Triewald, sometimes referred to as Mårten Triewald the Younger, was a Swedish merchant, engineer and amateur physicist. Mårten Triewald was the son of Mårten Triewald the Elder, a farrier and anchorsmith of German origin. Triewald's mercantile activities took him to London, and in 1716 he was employed as an inspector at a coal mine in Newcastle, where he studied mechanics and the steam engines used there, and made improvements to them. He returned to Sweden in 1726 and at Dannemora mine and built a steam engine there under the designation "fire and air machine". This steam engine is believed to be the first steam engine in Sweden that was put to practical and industrial use. In 1728 and 1729 Triewald held lectures in mechanics at the Swedish House of Nobility, and demonstrated a collection of physical instruments that he had bought in England. In 1732, these instruments were taken over by Lund University, and Triewald's assistant Daniel Menlös was made a professor of mathematics at the university. In 1729 he formed a diving company, and wrote about the use of diving bells and equipment for divers under the title Konsten att lefa under watn. He also took an interest in bee-keeping and published on this subject. Wikipedia [ - ]

Mårten Triewald, sometimes referred to as Mårten Triewald the Younger, was a Swedish merchant,... [ + ]