scholarly journals I. On a standard voltaic battery

1874 ◽  
Vol 164 ◽  
pp. 1-14 ◽  

The object which the author had in view in pursuing the investigations alluded to in the following paper was to discover some form of voltaic battery which should have a perfectly constant electromotive force, and should maintain a uniform difference of electric potential between its poles. This want has been much felt by electricians; and the utility of such an investigation may be best shown by a brief reference to the recent history of electrical measurement. In September 1861 a paper was read by the author before the British Association for the Advancement of Science advocating the adoption of a series of standard units of electrical measurement, and pointing out the mutual relations which should exist between such units. The subject was independently supported in Committee by Sir William Thomson, F. R. S., and the result was the appointment of a “ Committee on Standards of Electrical Resistance,” and a grant of money was set aside for the purposes of the Committee.

1907 ◽  
Vol 45 (3) ◽  
pp. 547-554
Author(s):  
C. G. Knott

The experiments which form the subject of the present communication were carried out two years ago, and supplement results already published. A brief note of some of the results was read before the Society in June 1904, and was also read before the British Association Meeting at Cambridge in August of the same year.The previous paper discussed the effect of high temperature on the relation between electrical resistance and magnetization when the wire was magnetized longitudinally, that is, in the direction in which the resistance was measured.The present results have to do with the effect of high temperature on the relation between resistance and magnetization when the magnetization was transverse to the direction along which the resistance was measured.


2015 ◽  
Vol 2014 ◽  
pp. vii-xxix
Author(s):  
Carlos González Echegaray

No one today doubts that the press is an essential tool to know and understand recent history of countries and nations. And not just from the standpoint of politics and economics but also of everyday life, reflected in these types of publications, sometimes undervalued by historians and others. The evolution of the press in developed countries has been the subject of several studies. A parallel action is needed for the still recently established African states, paying special attention to the post-independence period. For this research an inventory of the titles of those publications is essential, as well as bibliographic data that can be documented.


1969 ◽  
Vol 4 (2) ◽  
pp. 259-274 ◽  
Author(s):  
Eric J. Sharpe

To the student of the recent history of theological ideas in the West, it sometimes seems as though, of all the ‘new’ subjects that have been intro duced into theological discussion during the last hundred or so years, only two have proved to be of permanent significance. One is, of course, biblical criticism, and the other, the subject which in my University is still called ‘comparative religion’—the (as far as possible) dispassionate study of the religions of the world as phenomena in their own right.


1899 ◽  
Vol 22 ◽  
pp. 573-585 ◽  
Author(s):  
C. G. Knott

AbstractThe history of seismological research and discovery may be conveniently divided into three great epochs. 1. We have the recording of earthquakes in the popular significance of the term, with an enquiry into their character, based almost entirely upon the (usually) destructive results of their visitation. 2. We find investigators beginning to appeal to experiment to elucidate some of the effects noticed, with a growing appreciation of the necessity of recording all palpable earthquakes, whether destructive or not. One of the most honoured names in this connection is that of Mallet, whose two volumes on “The Great Neapolitan Earthquake” form a classic in the literature of the subject. Most of the developments of recent times will be found in embryo in the pages of this monumental work. 3. The introduction of instruments for recording earthquakes, and, as a natural consequence, the recognition of pulsations and tremors and the various kinds of earthquake too feeble to be detected by our senses.At every stage in this history, geological and physical problems of intrinsic difficulty have been encountered; and it is to the discussion of some of the most recent of these that this address is devoted.From the days of Mallet and Hopkins, numerous reports on earthquakes and seismological phenomena have been prepared and published by the British Association; and the last of these, from the industrious pen of J. Milne, F.R.S., formerly Professor of Mining in the Imperial University of Japan, has a surpassing wealth of detailed facts and of suggested theories.


1880 ◽  
Vol 7 (11) ◽  
pp. 488-491
Author(s):  
Henry Hicks

The subject of the recurrence of phenomena in geological time, so prominently brought forward by Prof. Ramsay in his recent address as President of the British Association, is one which cannot fail to be of interest to the geologist, as it constantly presents itself to him in all his inquiries. There are also doubtless many who are prepared to go with Prof. Ramsay to the length of his conclusions, and who believe “that from the Laurentian epoch down to the present day, all the physical events in the history of the earth have varied neither in kind nor in intensity from those which we now have experienced;” whilst others will be inclined to believe that though generally they have resembled one another in kind, yet that some have varied greatly in their intensity.


1872 ◽  
Vol 20 (130-138) ◽  
pp. 444-448 ◽  

In the year 1861 a Committee was appointed by the British Association for the Advancement of Science to report on standards of electrical resistance, and subsequently on other standards of electrical measurements. Reports were presented in 1862, 1863, 1864, 1865, and 1867. They recommended the adoption of a system of electromagnetic units based on the metre and gramme, the relations of the units being such that the unit of electromotive force acting through the unit resistance should give the unit current, and that the unit current flowing for the unit time should give the unit quantity.


1883 ◽  
Vol 174 ◽  
pp. 173-185 ◽  

Our experiments on the determination of the British Association unit of electrical resistance in absolute measure are detailed in two memoirs communicated to the Society. The conclusion to which they led us is that 1 B. A. unit=·9865 earth quadrant / second, but this result differs considerably from that obtained by some other experimenters, the original Committee included. Although in the present state of the question it is not desirable that the B. A. unit should fall into disuse, there can be no question as to the importance of connecting it with the mercury unit introduced now more than twenty years ago by Siemens. It will then be possible, as recommended by the Paris Conference, to express our absolute measurements in terms of mercury, by stating what length of a column of mercury at 0° of 1 square millimetre section has a resistance of 1 ohm. Accordingly the experiments about to be described relate to the expression in terms of the B. A. unit of the resistances of known columns of mercury at 0°. This investigation was the more necessary, as the principal authorities on the subject, Dr. Werner Siemens and Dr. Matthiessen, had obtained results differing by as much as ·8 per cent.


2008 ◽  
Vol 26 (1) ◽  
pp. 212
Author(s):  
Charles James

This study is an important contribution to access to justice scholarship and research. The subject is the English Court of Appeal as the authors found it in 2000–2001 responding to the deep and comprehensive agenda of change resulting from the “new public management” initiatives of the Tory and Labour governments in power during the 1980’s and 90’s. Although the study is concerned primarily with the present day operation and recent history of the Court of Appeal, significant events in the life of the court from its beginnings in the court restructuring legislation of the 1870’s are recounted and analyzed at appropriate junctures in the text. An important body of data was collected by the authors during 2000-2001 from which they describe and analyze the subjects, types and origins of cases, the throughput of applications and appeals and their outcomes, and in particular, the new requirement for permission to appeal.


Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.


2007 ◽  
Author(s):  
Eileen Ahearn ◽  
Mary Mussey ◽  
Catherine Johnson ◽  
Amy Krohn ◽  
Timothy Juergens ◽  
...  

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