. . . "Aitken, John"@en . . "John Aitken"@en . . . . . . "1919Z"^^ . . "1839-09-18Z"^^ . "Scottish meteorologist, physicist and marine engineer" . . . . "1839-09-08Z"^^ . "1839Z"^^ . "1919-11-14Z"^^ . . . "For others similarly named, see the John Aitken navigation page John Aitken, FRS, FRSE (1839\u20131919) was a Scottish meteorologist, physicist and marine engineer. He was one of the founders of cloud physics and aerosol science, who built the first apparatus to measure the number of dust and fog particles in the atmosphere, a koniscope."@en . .