Letter 4216

Triewald writes to Sloane from Sweden about some curious occurrences. He mentions the moon and its contributions to the Phenomenon as the sun to the appearance of a rainbow, which he perceived in the evening to the North at about 8 when the moon was just rising. He also witnessed strong vapours all over, fog and water mists in a fluid state. He writes of water and ice from an iron furnace and speaks as if he was on a ship looking back to shore during a severe cold. He sent a letter with some books he had recently published and asks if he should send the same to the Royal Society Library. Mårten Triewald (1691-1747) was a Swedish merchant, engineer, physicist, and military architect. He was elected a Fellow of the Royal Society in 1731 and served as the King of Sweden’s Director of Mechanics (http://en.wikipedia.org/wiki/Mårten_Triewald).