T. ANDREWS. — Experimental research on the electromotive force from difference of potential during diffusion in tidal streams (Recherche sur la force électromotrice produite par la diffusion dans les courants des marées); Proceedings of the Royal Society, t. XXXVII, p. 18; 1884

1885 ◽  
Vol 4 (1) ◽  
pp. 286-289
Author(s):  
Kkouchkoll
1885 ◽  
Vol 38 (235-238) ◽  
pp. 372-378

In a paper last session “On the Electromotive Force during Diffusion in Tidal Streams” (see “Proceedings Royal Society,” No. 232), the author recorded the electrical part of this investigation. The present communication contains the concluding gravimetric experiments of the research. The effects attending the diffusion of the salt and fresh water in tidal estuaries, on parts of the same metal, were estimated in each case for a period of one year , during which the metals were constantly exposed to conditions of galvanic action similar to those obtaining in some tidal streams.


1884 ◽  
Vol 37 (232-234) ◽  
pp. 28-35

An examination of the composition of the waters throughout the length of a tidal stream during diffusion of salt and fresh water consequent on tidal action, reveals a very considerable difference in the proportion of saline constituents between the water at the surface and that at the bottom, during certain times of tide this difference amounting sometimes to near 100 per cent., and it may frequently be either much greater or less according to tidal fluctuations. This fact constitutes the basis of the investigation which the author undertook, to obtain some approximate quantitative measurement of the resultant electromotive force, &c., arising from such difference of potential. It is known that a current is set up when a bar or plate of the same metal is immersed in two dissimilar solutions in contact, one capable of acting readily upon the metal, the other having little or no action on it, the whole forming a circuit.


1900 ◽  
Vol 65 (413-422) ◽  
pp. 433-433

I. “Note on the Electromotive Force of the Organ Shock, and on the Electrical Resistance of the Organ, in <italic>Malapterurus electricus</italic>” By Professor F. Gotch, F. R. S., and G. J. Burch. II. "On the Formation of the Pelvic Plexus, with especial Reference to the Nervus Collector, in the Genus <italic>Mustelus</italic>." By R. O. Punnett. Communicated by Dr. Gadow, F. R. S. III. “On the Least Potential Difference required to produce Discharge through various Gases.” By the Hon. R. J. Strutt. Communicated by Lord Rayleigh, F. R. S. IV. “Mathematical Contributions to the Theory of Evolution. VII — On certain Formulae in the Theory of Correlation, and their Application to the Inheritance of Characters not capable ot Quantitative Measurement.” By Professor Karl Pearson, F. R. S. V. “On the Propagation of Earthquake Motion to Great Distances" By R. D. Oldham. Communicated by Sir R. S. Ball, F. R. S. VI. “An Experimental Research on some Standards of Light. By J. E. Petavel. Communicated by Lord Rayleigh, F. R. S.


Author(s):  
Roberto de Andrade Martins

In 1840, James Prescott Joule submitted to the Royal Society a paper describing experimental research on the heat produced by electric currents in metallic conductors, and inferring that the effect was proportional to the resistance of the conductors and to the square of the intensity of the current. Only an abstract of this paper was published in the Proceedings of the Royal Society , although a full paper with a similar title was printed in the Philosophical Magazine in 1841. Several authors have assumed that the content of the 1841 publication was the same as the rejected 1840 paper; however, the unpublished manuscript has been found within the archives of the Royal Society and is published here for the first time, along with a detailed analysis and comparison with the 1841 paper. The unpublished version is much shorter, and is different in certain respects from the published article. A detailed comparison throws light on several shortcomings of the unpublished version. The present work also studies the assessment of Joule's paper by the Royal Society, and elucidates the roles of Peter Roget and Samuel Christie in this connection.


It is an honour to be here today in the company of such distinguished colleagues. It is also a privilege to be able to pay my respects to the Royal Society, which was organized three centuries ago to shift the whole course of science away from medieval disputation into experimental research. If this bold intellectual venture had either not been launched or had failed, we would not be meeting today—either here or anywhere else. I also salute my countryman, Benjamin Franklin, whose portrait I saw here this morning, not so much for his science as for his independence. If by awarding him its Copley Medal in 1753 for his theories about electricity, the Royal Society had hoped to lure him into the scientific revolution and away from the political one, it failed. Had it succeeded, the rest of you might be meeting here today, but I probably would not.


1860 ◽  
Vol 150 ◽  
pp. 595-609 ◽  

The following communication is an abridgement of a paper on the same subject presented to the Royal Society in 1858, with some additional matter that has been since disclosed by my experimental investigations. The original paper, being deposited in the Archives of the Society, is accessible for reference on points of detail that are here excluded. In 1848 it was announced by Bernard that the liver enjoyed a sugar-forming function. This statement appeared to rest upon irrefutable grounds, and the new function soon became almost universally acknowledged by physiologists. An animal which had been for some time previously restricted to an animal diet was suddenly killed. Sugar was found abundantly in the blood of the vena cava and hepatic veins, whilst none existed in that of the portal vein. The tissue of the liver was also found abundantly saccharine, whilst no sugar was to be detected in any other organ. I had seen this experiment several times performed in Bernard’s laboratory, and had often repeated it myself. From the correctness of the description of his results, I entertained no doubt as to the accuracy of Bernard’s deductions, and did not for a moment seek to question them. In the course of my experimental research, however, I was conducted step by step to a point which has placed me, involuntarily as it were, in antagonism with the glycogenic theory. By pushing investigation further than had hitherto been done, I have been compulsorily brought to arrive at conclusions of which I had not the most remote anticipation beforehand.


1896 ◽  
Vol 59 (353-358) ◽  
pp. 231-233 ◽  

In the ‘Proceedings of the Royal Society,’ vol. 58, pp. 142, &c., will be found the first account of the measurement of stellar radiation by means of the electromotive force generated by the action of starlight on my photo-electric cells. The observations were resumed in the beginning of January, 1896, in Mr. W . E. Wilson’s observatory by the same three observer—namely, Mr. Wilson, Professor Fitzgerald, and myself.


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