360 



Anniversary Meeting. 



[Nov. 30, 



revoMug apparatus, which was instantly adopted by our own eclipse 

 parties, and will probably be the only photographic instrument used in 

 future transits. 



Janssen is at the present time engaged in organizing a physical obser- 

 A^atory, and is taking daily photographs of the sun, preliminary to obtain- 

 ing daily spectrum-photographs to elucidate all those inquiries which 

 have been raised by his former work. 



I have limited this statement to those researches of M. Janssen which 

 have reference to the Eumford Medal. In the sixty notices of his papers 

 printed in the ' Catalogue of Scientific Papers,' some will be found on 

 other branches of knowledge, the results of his many scientific missions, 

 of which a list is appended : — 



1857-58. Determination of the Magnetic Equator on the Coast of Peru. 



1861-62. Study of the Telluric Lines in Italy. 



1864. Continuation of this inquiry from high points in the Alps. 



1867. Observations of the Annular Eclipse at Trani (Italy). Observa- 



tions of the Eruption of Santorin. Magnetic Observations in 

 the Azores. 



1868. Observations of total Eclipse in India. Discovery of the new 



method. Optical and Magnetical observations at Simla. 



1870. Observations of total Eclipse in Africa. Janssen escaped from 



Paris in a balloon to make these. 



1871. Observations of the total Eclipse in Asia. 



1874. Observations of the Transit of Yenus in Japan. 



1875. Observations of a total Eclipse of the Sun in Siam. 



[The Medal was received by M. Janssen.] 



A Eoyal Medal has been awarded to Mr. William Eroude, E.E.S., for 

 his researches, both theoretical and experimental, on the Behaviour of 

 Ships, their oscillations, their resistance, and their propulsion. 



It is generally admitted that Mr. Eroude has done more than anybody 

 else towards the establishment of a reasonable theorj^ of the oscillation of 

 ships in wave-water, as vrell as for its experimental verification. The very 

 accurate instruments which he has contrived for the measurement of a 

 ship's oscillation at sea have even permitted him to measure (as a dif- 

 ferential phenomenon) the mean wave acting upon the ship with a degree 

 of exactness exceeding that with which it has hitherto been possible to 

 ascertain the profile of the surface-wave of the sea. 



He was also the first to establish on thoroughly sound principles the 

 mechanical possibility of that form of motion knovm as the trochoidal 

 sea-wave, which more nearly than any other appears to represent the 

 shape of smooth ocean-wave, and vrhich now forms the groundwork of 

 all useful theories of the oscillation of ships. 



He has also conducted a series of experiments, extending now over 



