EARTHQUAKE MEASUREMENTS IN PIT AND ON SURFACE. 



251 



taken. Specimentj of such comparison diagrams are given in PJ. 

 XXXV. The multiplying ratio of both sets of instruments was intended 

 to be five. If we go through the diagrams, we see that for moderate 

 motions both give waves of almost exactly the same amplitudes and 

 periods. Even small ar^^d irregular ripples are faithfully recorded. 

 Fig. 1 is for the East-AVest component instruments, and Fig. 2 is for 

 the North- South component instruments. In the following tables is 

 given the numerical comparison of the amplitudes of some of the 

 corresponding waves as recorded by the pit and surfice seisujographs. 



For E.W. Component Instruments. 



