Magnetic Variations at different Places, < 



195 



Eoyal Observatory, Greenwich. Copies of the Photographic Records of Magnetic 

 Elements and Earth Currents from 1884, Oct. 1, 16 h , to Oct. 2, 4 h , Greenwich 

 Civil Time. 



It will be seen how the rapid movement just before 22 h occurs simultaneously in 

 all elements, after a calm state. Downward motion on the paper indicates increase 

 of west declination, and of horizontal and vertical force, and in earth currents 

 corresponds to the passage of a current similar to that from the copper pole of a 

 battery in the direction Angerstein Wharf Lady Well in the one case, and in the 



