166 



REPORT — 1897. 



a number of extremely small movements recorded by the two seismo- 

 graphs which did not agree as to their times of occurrence. 



Should further comparisons of the records lead to agreements similar 

 to those here indicated, the conclusion will be that England is much more 

 frequently shaken by very small earthquakes than is generally supposed. 



Earthquake No. 83 (February 6, 1897). 



Shide Tieeords : 

 Preliminary tremors commence 

 2nd max. 

 3rd „ 

 4th „ 

 1st large waves commence 



,, „ „ end 

 2nd „ „ commence 



„ „ „ end 

 1st concluding vibrations 

 2nd 

 3rd 

 4th 



Duration of preliminary tremors 

 „ disturbance, about 



Strasshvrri Records. (Dr. G. Geeland with Dr. Ehleet's Pendulums.) 



On the third pendulum there were three maxima of tremors. 

 Duration of preliminary tremors, 38m. 27s. 



Potsdam. Dr. Eschexhagen. 



From a photographic reproduction of Dr. Eschenhagen's diagrams the 

 following times are obtained : — 



Commencement of preliminary tremors 

 Duration of „ 



Nicolaio)v 

 Tsoliia , 



