ox SEISMOLOGICAL INVESTIGATION. 177 



was moved to the east side, the object being to see whether such a cover- 

 ing had any effect on the character of the diurnal wave. 



The Observations (1806). 



1st tveek (Sept. S-T-J). — From the 8th to the 14th daily waves were 

 marked, but there was such a marked steady displacement towards the 

 valley on the west that adjustments were required almost daily. 



On the 8th and 1-ith it was fairly tine, but on all the other days there 

 was much rain and the weather was dull. The westei'ly motion, or down- 

 ward tilting towards the saturated valley, was also marked in the records 

 of T. 



2nd iveek (Sfpf. 14:-21). — Because the westerly motion had been so 

 great the sensibility of the instrument was reduced, with the result that 

 the daily wave was hardly visible. There was still, however, a westerly 

 tendency. The weather was dull or fine, but there was no heavy i-ain. 



3rd week (Sept. 21-27) :— 



Sept. 21. 1 5-24 hours slight tremors. Fine. S. wind. 



„ 22. 18-20 hours slight tremors. Fine. Strong S.W. wind. 



„ 23 Steady. Fine. Strong S.W. wind. 



„ 24. 12-19 hours slight tremors. Fine. W. wind. Eain at night. 



„ 25. Steady. Strong wind, rain. 



,, 26. Steady. Rain, but calm. 



„ 27. Steady. Stormy. S.W. wind. 



On the 21st, 22nd, 23rd, and 24th there were slight daily waves, but 

 after adjustment on the 25th the movement was barely visible. 



It may be inferred that with cloudy weather the daily wave has beert 

 small. The shock shown by T on the 21st is not shown. 



4th tveek {Sept. 28-Oct. 2) :— 



Sept. 28. East motion completed i P.M. Fine. W. wind. 



,, 29. East motion completed 4.45 P.M. Rain. S. wind. 



„ 30. East motion completed 2-30 to 3.30 p.m. Fine. N. wind. 



Oct. 1. East motion completed 3 30 p.m. Fine. \V. wind. 



For six hours before the above times the motion was easterly, and for 

 si.K hours after it was westerly. In no instance were the waves large. 



Two slight disturbances were noted, but these do not agree in time 

 with displacements observed on T. 



5ik week (Oct. 2-9) :— 



Oct. 2. East motion completed 5 p.m. West motion completed at 10.50 P.M. 



On all other days no movement. This was discovered as being due to 

 a spider, which was caught on Oct. 10. 

 6th iceek {Oct. 9-15) :— 



Oct. 9. East motion completed 3.15 p.m., and west at 9 p.m. Amp .Omni. 



Fine. W. wind. 

 „ 10. East motion completed 4 p.m. Amp. 3mm. Fine. S. breeze. 

 „ 11. No record. Dull. N. wind. 

 „ 12. East motion completed 6 P.M., and west at IShrs. Amp. 3mm. 



N. breeze. Dull. 

 „ 13. Record bad. A large tarpaulin placed on ground on west side of 



tent. Fine. N. wind. 

 „ 14. East motion completed about noon. Wave small. Fine. N.E. 



wind. 

 ,, 15. Bast motion completed 3 p.m., and west at 6.50 p.m. Amp. Gmm. 



Little rain. Dull. S. wind. 

 1897. N 



