. Bulletin. Science. Scale about i-i6tii. BAROGRAPH, b^ SELF-RECORDING MERCURIAL BAROMETER, £58. Figure 6.—Photographic registering mercurial barometer, typical commercial version. (Frorrt J. J. Hicks, Catalogue of . . Meteorological Instruments, London, , about 1870.) these "systems" were nained were directors of astro- nomical observatories, which were, at this time, the most active centers of meteorological observation. Wild was at the Bern Observatory,-- Secci at the Papal Observatory, Rome,-^ and George Hough at the Dudley Observatory, Albany, New York.^* While the Signal Co
. Bulletin. Science. Scale about i-i6tii. BAROGRAPH, b^ SELF-RECORDING MERCURIAL BAROMETER, £58. Figure 6.—Photographic registering mercurial barometer, typical commercial version. (Frorrt J. J. Hicks, Catalogue of . . Meteorological Instruments, London, , about 1870.) these "systems" were nained were directors of astro- nomical observatories, which were, at this time, the most active centers of meteorological observation. Wild was at the Bern Observatory,-- Secci at the Papal Observatory, Rome,-^ and George Hough at the Dudley Observatory, Albany, New York.^* While the Signal Corps seems to have acquired all of the principal "systems," some interesting instruments were developed at still other observatories, notably by Kreil at the astronomical observatory in ^ The principal impetus for this full-scale mechaniza- tion of observation undoubtedly came from the directors of astronomical observatories. Thus within little more than the decade of the 1860's were developed five new systems of meteoro- 22 P. H. Carl, Reperlorinm Jiir physikalische Technik, Munich, 1867, p. 162flF. 23 E. Lacroix, Etudes sur VExposition de 1867, Paris, 1867, vol. 2, p. 313ff. See also, Reports of the Commissioners to the Paris Universal Exposition, 1867, vol. 3, Washington, 1870, p. 570ff. 21 Annals of the Dudley Observatory, 1871, vol. 2, p. vii ff. -^ Karl Kreil, Entivnrf eines meteorologischen Beobachtungs-Sys- temsfiir die osterreichische Monarchie, Vienna, 1850. logical self-registry that were sufficiently well thought of to be adopted or copied by observatories outside their places of origin. Wild and Draper tell us that it was decided when their respective observatories were established—in 1860 and 1868—that all instru- ments should be self-registering. Each was obliged to design his own, being dissatisfied with the photo- graphic registers commercially available. The de- velopment of these systems would therefore appear to have been due, in
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