[11] Since the above was written, additional information on this clock has been published by H. E. Hoff and L. A. Geddes, "Graphic Recording before Carl Ludwig: An Historical Summary," _Archives Internationales d'Histoire des Sciences_, 1959, vol. 12, pp. 1-25. Hoff and Geddes call attention to a report on the clock by Monconys, who saw the instrument in 1663 and published a brief description and crude sketch (Balthasar Monconys, _Les Voyages de Balthasar de Monconys; Documents pour l'Histoire de la Science, avec une Introduction par M. Charles Henry_, Paris, 1887). Monconys says that the thermometer "causes a tablet to rise and fall while a pencil bears against it." The instrument shown in his sketch resembles a Galilean thermoscope. [12] 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. [13] But a Dutch patent was awarded to one William Douglas in 1627 for the determination of wind pressure (G. Doorman, _Patents for Inventions in the Netherlands during the 16th, 17th and 18th Centuries_, The Hague, 1942, p. 127), and Leonardo da Vinci left a sketch of both a wind pressure meter and a hygrometer (_Codex Atlanticus_, 249 va and 8 vb). [14] Gunther, _op. cit._ (footnote 8), pp. 433, 502. [15] Battista della Valle, _Vallo Libro Continente Appertiniente ad Capitanii, Retenere and Fortificare una Citta..._, Venetia, 1523 (reported under the date 1524 in G. H. Baillie, _Clocks and Watches, an Historical Bibliography_, London, 1951). [16] Dolland's instrument, called an "atmospheric recorder," is described in the _Official, Descriptive and Illustrated Catalogue to the Great Exhibition, 1851,_ London, 1851, pt. 2, pp. 414-415. As the George Dolland who joined the famous Dolland firm in 1804 would have been about 80 years of age in 1850, the George Dolland who exhibited this instrument may have been a younger relative. [17] The Osler anemometer and most of the other self-registering instruments mentioned in this paper are described and illustrated in C. Abbe, "Treatise on Meteorological Apparatus and Methods," _Annual Report of the Chief Signal Officer for 1887_, Washington, 1888. The use of the Osler instrument at the British Association's observatory at Plymouth is mentioned in the Association's annual reports from 1838. There were a number of earlier self-registering anemometers, but no evidence of their extended use. See J. K. Laughton, "Historical Sketch of Anemometry and Anemometers," _Quarterly Journal of the Royal Meteorological Society_, 1882, vol. 8, pp. 161-188.