. Bulletin. Science. K R. Figure 9.—Front and rear views of Seed's meteorograph, 1867. (From Lacroix, op. cit. footnote 22.) Hough's barometer was an adaptation of the elec- trical contact thermometer. The movement of the mercury over a certain minute distance within the tube served as a switch to energize an electrical recording system. Hipp, who was perhaps the latest of this group, first applied the aneroid barometer (fig. 8) to self-registration. The idea of the aner- oid—an air-tight bellows against which the atmos- pheric pressure would act—had been advanced by Leibniz in the 17th centur
. Bulletin. Science. K R. Figure 9.—Front and rear views of Seed's meteorograph, 1867. (From Lacroix, op. cit. footnote 22.) Hough's barometer was an adaptation of the elec- trical contact thermometer. The movement of the mercury over a certain minute distance within the tube served as a switch to energize an electrical recording system. Hipp, who was perhaps the latest of this group, first applied the aneroid barometer (fig. 8) to self-registration. The idea of the aner- oid—an air-tight bellows against which the atmos- pheric pressure would act—had been advanced by Leibniz in the 17th century and had been the subject ideas to a friend. But Morland's was probably the inclined and not the balance barometer. (.See under "barometer" in Charles Hutton, Mathematical and Philosophical Dictionary, London, 1796, vol. 1; also J. K. Fischer, Physikalisches Worter- buch, Gottingen, 1798). of a few abortive experiments in the 18th century. Not until 1848 was an instrument produced that was acceptable to users of the barometer.^' As a wind velocity instrument all si.\ systems used the cup-anemometer developed by Robinson in 1846, an instrument whose chief virtue was the care which its in\-entor had taken to work out the relationship be- tween its movement and the actual velocitv of the -' Leibniz, in several letters—beginning with one to Denys Papin on June 21, 1697—proposed the making of a barometer on the model of a bellows. Of subsequent versions of such a barometer, that of Vidi (described by Poggendorff, Annalen der Physik und Chemie, 1848, Band 73, p. 620) is generally regarded as the first practical aneroid (see also Gerland and TraiimuUer, op. cit. footnote 1, pp. 239, 323). PAPER 23: THE INTRODUCTION OF SELF-REGISTERING METEOROLOGICAL INSTRUMENTS 109. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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