n 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