scholarly journals IV. On the meteorological results shown by the self-registering instruments at Greenwich during the extraordinary storm of October 30,1863

1864 ◽  
Vol 13 ◽  
pp. 19-21
Keyword(s):  
Royal Society ◽  
The Self ◽  
Royal Observatory ◽  
Meteorological Instruments

In the year 1841 Osier’s anemometer was erected at the Royal Observatory, Greenwich, and from that time, up to the year 1860, the greatest pressure on the square foot recorded was 25 lbs. In February 1860 one of 28 lbs. was registered, which was the greatest up to October 30 of the present year; on that day a pressure of no less than 291/2 lbs. took place during a heavy squall of wind and rain, which passed over the observatory at 3h. 30m. P. M. At this time, moreover, the readings of the several other self-registering meteorological instruments at the Royal Observatory, Greenwich, exhibited very large changes, and of so remarkable a character, that the Astronomer Royal expressed a wish that I should bring them under the notice of the Royal Society. The following are extracts from the several registers of the day mentioned:- At 6h. A. M., on October 30, the barometer read 29·32 in., and it commenced falling slowly after this time, reaching 29·30 in. at 8h. A. M. The decrease then became more decided, and a steady fall was experienced; 29·10 in. was reached by 01/2h. P. M., and 28·96 in. by 2h. P. M.; from 2h. P. M. to 31/2h. P. M. the decline was very rapid; and the minimum reading, 28·80 in., was reached at the latter time.

scholarly journals XI. Note on an extension of the comparison of magnetic disturbances with magnetic effects inferred from observed terrestrial galvanic currents; and discussion of the magnetic effects inferred from galvanic currents on days of tranquil magnetism

1870 ◽  
Vol 160 ◽  
pp. 215-226 ◽  
Keyword(s):  
Royal Society ◽  
Principal Part ◽  
The Self ◽  
Magnetic Disturbance ◽  
Magnetic Effects ◽  
The Earth ◽  
Royal Observatory ◽  
Magnetic Disturbances

In a communication to the Royal Society, which was honoured by publication in the Philosophical Transactions for 1868, I described the methods and gave the results of comparing the Magnetic Disturbances which might be expected as consequent on the Terrestrial Galvanic Currents recorded by the self-registering galvanometers of the Royal Observatory of Greenwich, with the Magnetic Disturbances actually registered by the self-registering magnetometers. The comparison was limited to seventeen days (1865, October 5 and 31; 1866, October 4; 1867, April 4, 5, 7, 8, 9, 11, May 4, 14, 28, 31, June 1, 2, 7, 24), various days having been omitted in consequence of a doubt on the uniformity of the clock-movement of the registering-barrel, which afterwards proved to be unfounded. The results of the comparison were exhibited in curves, engraved copies of which are given in the volume of publication. I expressed my opinion that it was impossible to doubt the general causal connexion of the Galvanic Currents with the Magnetic Disturbances, but that some points yet remained to be cleared up. As soon as circumstances permitted, I undertook the examination of the whole of the Earth-currents recorded during the establishment of the Croydon and Dartford Wires (namely from 1865 April 1 to 1867 December 31), as far as they should appear to bear upon this and similar questions. For this purpose the days of observation were divided by Mr. Glaisher into three groups. Group No. 1 contained days of considerable mag­netic disturbance (or days of considerable galvanic disturbance, which are always the same), including, besides the seventeen days above-mentioned, the thirty-six days of the following list :—1865, April 15, 16, 17, 18, 19, May 14, 17, July 7,15, August 14,19, 26, September 8, 16, 28, October 4, 6, 10, 12, 14, November 1; 1866, August 11, 23, September 8, 9,12,13,17,18, 25, October 6, 7,10, 30, November 26 ; 1867, February 8; making in all fifty-three days of considerable magnetic disturbance. Group No. 2 consisted of days of moderate magnetic disturbance, and of these no further notice was taken. Group No. 3 contained the days of tranquil magnetism, and the discussion of these will form the principal part of the present Memoir.

scholarly journals I. Monthly means of the highest and lowest diurnal tem­peratures of the water of the Thames, and comparison with the corresponding temperatures of the air at the Royal Observatory, Greenwich

1883 ◽  
Vol 34 (220-223) ◽  
pp. 275-284
Keyword(s):  
Royal Society ◽  
The Self ◽  
Partial Reduction ◽  
Medical Department ◽  
Registrar General ◽  
Sanitary Condition ◽  
Royal Observatory ◽  
History Of ◽  
Hospital Ships ◽  
Made In

In presenting to the Royal Society a partial reduction of the thermometrical observations made in the water of the Thames during a period of thirty-five years, I commence with a brief history of the undertaking and progress of this work. The observations were instituted at the suggestion of the con­ductors of the Medical Department in the Office of the Registrar-General of Births, Deaths, and Marriages, with the view of supplying some knowledge of an element which may possibly affect the sanitary condition of the Metropolis. The plan of observations was arranged at the Royal Observatory of Greenwich; and the instruments were procured and mounted, and repaired, when necessary, under the care successively of James Glaisher, Esq., and William Ellis, Esq., Superintendents of the Magnetical and Meteorological Department of the Observatory. The self-recording instruments were attached to the Hospital Ships successively anchored in the Thames, nearly opposite to Greenwich: and their records were read and registered by the medical officers of those ships, and these written registers were transmitted every week to the Royal Observatory. And I cannot too strongly express my sense of the care with which the observations were made, the fidelity with which they were recorded, and the order and regularity with which they were transmitted to the Royal Observatory. The weekly register, when received at the Observatory, was combined with the brief record of other meteorological facts observed at the Royal Observatory, and (with the medical record) was published every week by the Registrar-General.

scholarly journals XXII.—Notice of the Completion of the New Rock Thermometers at the Royal Observatory, Edinburgh, and what they are for

1880 ◽  
Vol 29 (2) ◽  
pp. 637-656
Author(s):  
Piazzi Smyth
Keyword(s):  
Royal Society ◽  
Royal Observatory ◽  
Government Contract

On the 26th of last month the full year appointed by Government Contract for the testing of the new Rock-Thermometers having expired, and they having approved themselves at all points, been accepted, and set fairly afloat on a new course of observation,—I hasten to announce the event to the Royal Society, Edinburgh, who have long had a lively interest both in these instruments and in the problems they have been employed upon.

scholarly journals 1. Sequel to a paper on the reduction of the thermometrical observations made at the apartments of the Royal Society, with an appendix

1851 ◽  
Vol 5 ◽  
pp. 925-927
Keyword(s):  
Royal Society ◽  
Periodic Variation ◽  
Severe Weather ◽  
Royal Observatory

The principal object of this paper is the connexion of the results deduced in a former paper from the observations at the Royal So­ciety’s Apartments, with the observations at the Royal Observatory at Greenwich, in order to determine mean numerical values, and to establish the laws of periodic variation from this long series of obser­vations ; the two series of observations are here induced to one and the same series. The observations at the Royal Society having been discontinued between the years 1781 and 1786, it was necessary to supply this link in the series, more particularly as these years were distinguished by very severe weather, and their omission would have a sensible effect on the results. The deficient observations have been supplied by a comparison of the observations which were made at Somerset House, with the observations during the corresponding years made by Mr. Barker at Lyndon in Rutlandshire, from 1771 to 1799, cor­rections being thus obtained for reducing the Lyndon observations to those at Somerset House.

scholarly journals I. Note on an extension of the comparison of magnetic disturbances with magnetic effects inferred from observed terrestrial galvanic currents; and discussion of the magnetic effects inferred from galvanic currents on days of tranquil magnetism

1870 ◽  
Vol 18 (114-122) ◽  
pp. 183-185
Keyword(s):  
Magnetic Force ◽  
The Self ◽  
Instrumental Error ◽  
Magnetic Disturbance ◽  
Magnetic Effects ◽  
Royal Observatory ◽  
Moderate Disturbance ◽  
Magnetic Disturbances ◽  
Made In

The author, after referring to his paper in the Philosophical Transactions for 1868 on the comparison of Magnetic Disturbances inferred from Galvanic Currents recorded by the Self-registering Galvanometers of the Royal Observatory of Greenwich with the Magnetic Disturbances registered by the Magnetometers, on 17 days, states that he had now undertaken the examination of the whole of the Galvanic Currents recorded during the establishment of the Croydon and Dartford wires (from 1865 April 1 to 1867 October 24). The days of observation were divided into three groups,—No. I containing days of considerable magnetic disturbance, and therein including not only the 17 days above mentioned, but also 36 additional days, No. 2 containing days of moderate disturbance, of which no further use was made, and No. 3 containing the days of tranquil magnetism. The comparisons of the additional 36 disturbed days were made in the same manner as those of the preceding 17 days, and the inferences were the same. The results were shown in the same manner, by comparison of curves, which were exhibited to the Society. The points most worthy of notice are, that the general agreement of the strong irregularities, Galvanic and Magnetic, is very close, that the galvanic irregularities usually precede the magnetic, in time, and that the northerly magnetic force appears to be increased. The author remarks that no records appeared open to doubt as regards instrumental error, except those of western declination; and to remove this he had compared the Greenwich Curves with the Kew Curves, and had found them absolutely identical.

scholarly journals XII.—On the Climate of Edinburgh for Fifty-six years, from 1795 to 1850, deduced principally from Mr Adie's Observations; with an Account of other and Earlier Registers

1861 ◽  
Vol 22 (2) ◽  
pp. 327-356 ◽  
Author(s):  
James D. Forbes
Keyword(s):  
Royal Society ◽  
Short Account ◽  
Long Time ◽  
Meteorological Instruments

1. The late Mr Alexander Adie, optician, and Fellow of the Royal Society of Edinburgh, was so generally known to be a zealous and careful observer of meteorological instruments, that an attempt to combine the results deducible from his labours carried on (though with one long break) over more than forty years, cannot be otherwise than interesting.2. The plan of superintending the careful reduction of the thermometrical part of Mr Adie's registers occurred to me a long time ago, but circumstances prevented the execution of it until two or three years since, when, through the kindness of Mr Adie and his family, the whole of the manuscript observations, commencing with 1795, were put into my hands, and the Council of the Royal Society of Edinburgh provided sufficient funds for the employment of computers for reducing them.3. The work has proceeded with frequent interruptions, but is at length complete. Before I proceed to detail the particulars of the reductions and their results, I will give a short account of the earlier observations on the climate of Edinburgh which I have been able to trace, some of which perhaps have hitherto escaped notice.

scholarly journals XIII. Results deduced from the measures of terrestrial magnetic force in the horizontal plane, at the Royal Observatoy, Greenwich, from 1841 to 1876

1885 ◽  
Vol 176 ◽  
pp. 679-689
Keyword(s):  
Royal Society ◽  
Horizontal Plane ◽  
Magnetic Force ◽  
Proper Part ◽  
Royal Navy ◽  
Sliding Windows ◽  
Short Statement ◽  
Royal Observatory ◽  
Real Progress ◽  
Made In

In offering to the Royal Society some results deduced from the systems of magnetic observation and magnetic self-registration established several years since at the Royal Observatory, Greenwich, during a portion of the time in which I presided over that institution, I think it desirable to premise a short statement on the origin of the Magnetic Department of the Royal Observatory, and on the successive steps in its constitution. It appears to have been recognised many years ago, that magnetic determinations would form a proper part of the business of the Royal Observatory. When I commenced residence at the Royal Observatory, at the end of 1835, I found in the garden a small wooden building, evidently intended for the examination of compasses, perhaps of the size of those used in the Royal Navy. But the locality was inconvenient, and the structure was totally unfit for any delicate magnetic purpose; for instance, the balance-weights of the sliding windows were of iron. For some preliminary experiments a small observatory was borrowed from Captain Fitzroy, but no real progress was made in magnetism.

scholarly journals Total solar eclipse, 1905, August 29-30. Preliminary report of the observations made at Guelma, Algeria

1906 ◽  
Vol 77 (514) ◽  
pp. 56-76
Keyword(s):  
Solar Eclipse ◽  
Royal Society ◽  
Preliminary Report ◽  
Total Solar Eclipse ◽  
The South ◽  
Royal Astronomical Society ◽  
The North ◽  
Royal Observatory ◽  
The Government ◽  
Government Grant

The expedition to which this report refers was one of those organised by the Joint Permanent Eclipse Committee of the Royal Society and the Royal Astronomical Society; it was supported by a grant made by the Government Grant Committee. Guelma was chosen for the site of the observations, as being an inland station between Sfax, which was selected for an expedition from the Royal Observatory, Greenwich, and Philippeville, which it was at first expected Sir Norman Lockyer would occupy. Guelma is 58 kilometres from Bona, 65 kilometres from Philippeville, 55 kilometres from the nearest coast of the Mediterranean Sea; it lies at a height of about 1200 feet above sea-level on the south side of the Valley of the Seybouze, amongst hills which range in height from about 3100 feet at 13 kilometres to the north, to about 4700 feet at 11 kilometres on the south, where lies the celebrated mountain, Mahouna, “the sleeping lady,” so called from the resemblance of its silhouette to the form of a woman. (For the position of the observing hut, see p. 59.)

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