I 



PROCEEDINGS 01" THE COTTESWOLD CLUB 193 



a vertical axis by clock work. The instrument is screwed 

 firmly to a bracket attached to one of the internal walls of 

 the house. The long arm, or lever, which carries the 

 recording pen is so sensitive to changes of vertical pressure 

 that the mere employment of a housemaid's brush near 

 the instrument is enough to cause a vertical displacement, 

 of I-I2th of an inch in the ink trace. If, then, there was 

 any vertical movement of the wall during the shock, there 

 would undoubtedly be a straight vertical line observable 

 in the ink trace. If the movement was purely horizontal 

 the pen would be simply jerked away from the paper and 

 would fall back to its former position. I examined the 

 register shortly after the shock and could find no trace 

 whatever of any vertical irregularity in the barometric 

 line." 



Mr Madan goes on to say — " I have seen here (at 

 Gloucester) one interesting piece of evidence respecting 

 the direction of the earthquake wave. A large iron 

 ornamental vase, weighing at least 3 or 4 cwt., with square 

 pedestal, stands in the middle of a lawn on a square block 

 of stone sunk in the ground. A few hours after the 

 earthquake this vase was found to have been moved side- 

 ways on its stone foundation through a space of about an 

 inch, or rather more. I laid a long straight lath close to 

 it, and adjusted the lath so as to lie as nearly as possible 

 in the direction of displacement. I then took compass 

 readings near each end of the lath (to eliminate any 

 deflexion due to the mass of iron). The mean of the 

 readings gives (magnetic) N. 18^ 30' E. as the direction 

 in which the vase had been shifted by the movement of 

 the earth underneath it. Since the magnetic declination 

 at Gloucester is now approximately 18*^ W., this would 

 show that the oscillations took place in a plane lying very 

 nearly due (geographical) north and south." 



