556 Prof. G. H. Darwin. 



' Second Series of Results of the Harmonic Analysis of 

 Tidal Observations." Collected by G. H. DARWIN, LL.D., 

 F.R.S., Fellow of Trinity College and Plumian Professor 

 in the University of Cambridge. Received January 18, 

 Read February 7, 1889. 



A collection of results by Major Baird and myself has been already 

 published in the 'Proceedings of the Royal Society,' No. 239, 1885; and 

 the present paper brings together new results which 1 have been able to 

 collect since the date of that paper. I begin with some remarks on 

 the sources of information, and on the observations at each station. 

 A table of the latitudes and longitudes of the places of observation is 

 prefixed to those of the harmonic constants. 



Dover. 



In the Second Report of the Committee of the British Association 

 on the " Tides of the English Channel and the North Sea" (1879), the 

 following passage occurs : 



" The importance of an accurate knowledge of the tides at Dover 

 in particular, in connection with those of the entire English Channel, 

 being soon made evident to the Committee, as well as the great advan- 

 tage which would ensue from the establishment of a self -registering 

 tide-gauge at that place, the matter was brought by the Chairman 

 under the notice of the Board of Trade ; the request being further 

 supported by the Lord Warden of the Cinque Ports, Earl Granville. 

 The Board of Trade received the request most favourably, and con- 

 sented to establish at their own expense a self -registering gauge, at a 

 site some distance down the Admiralty Pier, where a tide-well had 

 been made during the original construction of the pier ; its connection 

 with the water outside being at a level twelve feet below the low 

 water of ordinary spring tides. The gauge, embracing Sir William 

 Thomson's latest improvements, has been constructed and erected by 

 Messrs. A. Lege and Co., under the direction of Mr. Edward 

 Druce, C.E., the resident engineer in charge of the Admiralty Works 

 at Dover. It will remain, of course, in the hands of, and under the 

 control of the Board of Trade." 



In 1886 another Committee of the British Association, appointed to 

 consider the tides of Dover, exhibited to the meeting the tide-curves 

 for Dover for the four years 1880-83, and it was stated that the 

 Minister of Public Works of Belgium had presented to the Secretary 

 of the Committee copies of the self-registered tide-curves for Ostend 

 for several years. A comparison of the high and low waters at the 

 two ports during one lunation is given in the Report of this Com- 

 mittee. 



