Meteorology known as the first "anemometer". In 1607, Galileo Galilei constructed a thermoscope. In 1611, Johannes Kepler wrote the first scientific treatise on snow crystals: "Strena Seu de Nive Sexangula (A New Year's Gift of Hexagonal Snow)". In 1643, Evangelista Torricelli invented the mercury barometer. In 1662, Sir Christopher Wren invented the mechanical, self-emptying, tipping bucket rain gauge. In 1714, Gabriel Fahrenheit created a reliable scale for measuring temperature with a mercury-type thermometer. In 1742, Anders Celsius, a Swedish astronomer, proposed the "centigrade" temperature scale, the predecessor of the current Celsius scale. In 1783, the first hair hygrometer was demonstrated by
Anders Sandvig Samlinger") in 1904. Sandvig was at first hired as unpaid curator, but was later appointed the museum's first director. In addition to expanding the museum significantly, Sandvig also traveled extensively to promote ethnological museums, including Vesterheim in Decorah, Iowa. He retired from the museum in 1947, at 85 years of age. Anders Sandvig Anders Sandvig (11 May 1862 – 11 February 1950) was a Norwegian dentist most noted for having founded Maihaugen, an innovative regional ethnological and architectural museum in Lillehammer, documenting the vernacular architecture of Gudbrandsdalen. Sandvig was born at Bud in Møre og Romsdal, Norway. He first worked