Harmonie Analysis of Tidal Observations. 



at the station of Kobe is of a different type, having the drum hori- 

 zontal, and was constructed by Bailey and Co. At the port of Yoko- 

 hama a tide-staff graduated in shahi and sun is vertically fixed at a 

 place where the Avater is very calm, and the direct readings of the 

 heights of the water are taken every hour. The instruments of 

 the improved form by Sir W. Thomson are so well known that 

 there is no need to describe them in detail. So only two photo- 

 graphs are inserted here. These instruments are well constructed, 



and although they liave been in use since the first establishment 

 of these observatories, they are still in good order, and give little 

 trouble. 



