Tyndall
JOHN, an English physicist; born in Leighlin Bridge, near Carlow, Ireland, Aug. 21, 1820. He studied in Germany; in 1850 published in the of the Royal Society in 1852; Professor of Natural Philosophy at the Royal Institution in 1853, and in 1867 its superintendent. He was the first to climb the Weisshorn, and subsequently reached the summit of the Matterhorn; and published: "Philosophical Transactions in Glaciers of the Alps" (1860); "Mountaineering in 1861" (1862); and "Hours of Exercise in the Alps" (1871). "Heat Considered as a Mode of Motion" appeared in 1863; "Dust and Disease," 1870. In 1872 he lectured in the United States; the profits he devoted as a fund "in aid of students who devote themselves to original research." Besides the works mentioned, he published: "Sound: A Course of Eight Lectures" (2d ed. as a 1875) "Faraday as a Discoverer" (1868) ; "Nine Lectures on Light" (1870); "Essays on the Use and Limit of the Imagination in Science" (1871); "The Forms of Water in Clouds and Rivers, Ice, and Glaciers" (1872); "Essays on the Floating Matter of the Air" (1881); ; and "New Fragments" (1892); besides many others. He received honorary degrees from the Universities of Cambridge and Edinburgh, and was made D. C. L. by Oxford. He died in Haslemere, Surrey, England, Dec. 4, 1893.