scholarly journals XXV. Observations on the Errors in the Sea-Rates of Chronometers, arising from the Magnetism of their Balances; with Suggestions for removing this source of Error

1823 ◽  
Vol 9 (2) ◽  
pp. 353-364 ◽  
Author(s):  
William Scoresby
Keyword(s):  
Royal Society ◽  
Small Degree ◽  
North Pole ◽  
The North ◽  
Magnetic Action ◽  
Source Of Error

The value of the Chronometer for finding the Longitude at Sea, being, by the experience of many years trial, fully established, I am induced to offer to the Royal Society some remarks on the change of rate observed in this instrument, when on ship-board. This change of rate, that had usually been supposed to arise from the motion of the ship, has recently heen attributed, by Mr Fisher, who accompanied Captain Buchan in his Voyage towards the North Pole in the year 1818, ‘to the magnetic action exerted by the iron in the ship upon ‘the inner rim of the Chronometer's balance, which is composed of steel.’ I apprehend, however, that it will be very easy to show, that although the alteration of rate may be, and most probably is, owing to magnetism, yet the magnetic action of the iron in the ship, excepting in cases where chronometers are placed in immediate contact with large masses of iron, can contribute but in a very small degree to the error in question.

scholarly journals On the errors in longitude as determined by chronometers at sea, arising from the action of the iron in the ships upon the chronometers

1833 ◽  
Vol 2 ◽  
pp. 130-131
Keyword(s):  
North Pole ◽  
South Pole ◽  
The North ◽  
Magnetic Action

The sudden alterations in the rates of chronometers, when taken on board ships, are generally ascribed to the motion of the vessel; but from circumstances connected with the chronometers of the Dorothea and Trent, during the late voyage to the North Pole, the author is induced to refer these alterations to other causes: he found that in all cases the gaining rates were increased and their losing ones diminished on ship-board. That this acceleration does not arise from the ship’s motion, was shown by its occurrence when the Dorothea and Trent were beset with ice, and when they were at anchor close in shore without any perceptible motion; nor does it appear that change of temperature was at any time the cause of this change of rates. That the iron in ships becomes magnetic is shown by its polarity, the whole forming, as it were, a large magnet, having its south pole on deck and its north pole below. The inner rim of the balance of chronometers, which is made of steel, will, therefore, be liable to magnetic action, which will be sufficient to cause a very sensible alteration in their rate of going. Mr. Fisher concludes this communication with some account of experiments on the action of magnets upon chronometers placed in various positions with respect to their balances, by which it appears that an acceleration in these cases always ensues. It also appears probable, he observes, that the force of the balance spring is affected by the same cause, since chronometers in which they are made of gold, though more difficult to adjust, keep better rates at sea than others.

XIX.—Note on Professor Whittaker's Atomic Model

1926 ◽  
Vol 45 (3) ◽  
pp. 245-248 ◽  
Author(s):  
John A. Eldridge
Keyword(s):  
Electric Current ◽  
Royal Society ◽  
Electronic Energy ◽  
North Pole ◽  
Atomic Model ◽  
Magnetic Current ◽  
Emit Radiation ◽  
The North ◽  
Spectrum Excitation ◽  
Axis Of Symmetry

In the Proceedings of the Royal Society of Edinburgh for 1921–22 Whittaker suggests an atomic model designed to absorb and emit radiation by quanta. This model consists essentially of a system of radial magnets, set as the spokes of a wheel with like poles (say south) at the centre. The electron approaching the wheel along the axis of symmetry will, according to the author, set the wheel into rotation, giving a “magnetic current.” The action of the approaching charge, giving a rotation to the North Pole and a “magnetic current,” is quite the analogue to the North Pole approaching a non-axial electric charge, setting it into rotation, and producing an “electric current.” The electron, with energy exceeding a definite value, succeeds in going through the atom, with the result that a definite amount of energy is permanently transferred from the electron to the atomic wheel, a result which resembles the absorption of electronic energy by the atom in spectrum excitation.

scholarly journals I. Report of the observations of the total solar eclipse of August 29, 1886, made at Carriacou

1887 ◽  
Vol 42 (251-257) ◽  
pp. 316-318
Keyword(s):  
Solar Eclipse ◽  
West Indies ◽  
Royal Society ◽  
Total Solar Eclipse ◽  
Small Island ◽  
Small Islands ◽  
The West ◽  
The North

Carriacou is a small island situated about twenty miles to the north of the island of Grenada, the chief of the Windward group, and furnished an excellent site for the observation of the last solar eclipse. Most of the observers sent by the Eclipse Committee of the Royal Society to the West Indies in August of last year remained at Grenada, or on the small islands in its immediate vicinity, whilst Mr. Maunder and myself occupied the more distant northern station, where the totality was slightly diminished in duration. The work proposed for Mr. Maunder was to secure a series of photographs of the corona, with exposures of 40s. and under, and also to obtain two photographs of the spectrum of the corona with the longest exposures possible.

Aerial observations of sea ice and melt ponds near the North Pole during CHINARE2010

2017 ◽  
Vol 36 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Lanyu Li ◽  
Changqing Ke ◽  
Hongjie Xie ◽  
Ruibo Lei ◽  
Anqi Tao
Keyword(s):  
Sea Ice ◽  
North Pole ◽  
The North ◽  
Melt Ponds

XIV.—Rowett Research Institute

1951 ◽  
Vol 64 (3) ◽  
pp. 257-276
Author(s):  
D. P. Cuthbertson
Keyword(s):  
Royal Society ◽  
Research Council ◽  
Medical Research Council ◽  
Agricultural Research ◽  
Research Work ◽  
Animal Nutrition ◽  
College Of Agriculture ◽  
The North ◽  
Agricultural Research Council ◽  
The University

The Rowett Institute for research on animal nutrition had its origin under a scheme for promoting scientific research in agriculture adopted by the Development Commission in 1911.The Governing Body, which originally consisted of an equal number of members appointed by the Court of the University of Aberdeen and the Governors of the North of Scotland College of Agriculture, was constituted in 1913. Within recent years it has been expanded to include persons nominated by the Secretary of State for Scotland, the Royal Society, the Royal Society of Edinburgh, the Agricultural Research Council, and the Medical Research Council. Research work was begun in temporary accommodation in Marischal College in 1914, under the direction of Dr John Boyd Orr—now Lord Boyd-Orr—who continued as Director until his retirement in 1945.

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