Note 12 — The First Self-Registering Instruments
Reading edition
Hooke's "oat-beard hygrometer" was described in 1667, but Torricelli seems to have invented the same thing in 1646, according to E. Gerland, "Historical Sketch of Instrumental Meteorology," in "Report of the International Meteorological Congress Held at Chicago, Ill., August 21-24, 1893," O. L. Fassig, ed., U.S. Weather Bureau Bulletin No. 11, pt. 3, 1896, pp. 687-699.