340 BEPORTS ON THE STATE OF SCIENCE. — 1920. 



Mr. T. Wright, of the Nautical Almanac Office, has analysed records by Darwin's 

 methods with aid from the Royal Society Government Grant Fund. 



Darwin and Messrs. Selby and Hunter have analysed with the abacus records for 

 Antarctic expeditions, and Selby has similarly analysed records for the National 

 Physical Laboratory. 



Roberts has made new analyses for Liverpool and Dover, the former for a British 

 Association Committee, the latter with the aid of a small grant from the Royal 

 Society Fund. 



In New Zealand tidal work began in 1909 and has been entirely under the charge 

 of Mr. 0. E. Adams, the Government Astronomer. Records have been analysed by 

 the use of Darwin's abacus and computation forms, and the results checked by 

 Mader's mechanical analyser. This appears to be the only use that has been made 

 of mechanical analysers, in spite of the number of different machines that have 

 been invented. 



In Western Australia records have been taken and analysed by the Government, 

 under the direction of Messrs. Cooke and Curie wis, Government Astronomers. 



Prof. D'Arcy Thompson has studied averages of consecutive high and low waters at 

 Aberdeen. Dundee and Milford Haven, giving values for Ssa and Sa at these Stations. 

 He has also published lists of Ssa and Sa constants obtained from various sources. 



The Admiralty has announced that for the North Sea the customary methods of 

 harmonic analysis lead to predictions which are entirely in error. 



In 1911 the British Government, in connection with the 'Conseil Permanent 

 International Pour I'Exploration de la Mer,' began the taking and harmonic analysis 

 of continuous observations of tidal currents in the North Sea. 



British Work on Harmonic Analysis of Tidal Heights. 



BlBIilOGEAPHY. 

 1868.* Sir W. Thomson, Report of 'Committee for the purpose of promoting the 

 extension, improvement, and harmonic analysis of tidal observations.' 

 Brit. Assoc. Reyort, pp. 489-505. [Thomson's Circular is reprinted in Pop. 

 Led. and Add., pp. 209-223]. 



E. Roberts, Report supplementary to Thomson's, Brit. Assoc. Bej?ort, pp. 

 505-610. 



1870. Sir W. Thomson, Report of same Committee for 1869, Brit. Assoc. Report, 

 pp. 120-123. 



Sir W.Thomson, Report of same Committee for 1870, rJi<Z. pp. 123-126; 148-161. 

 E. Roberts, ' Statement of work performed by him,' ibid. pp. 125-148. 



1871. E. Roberts, Report of same Committee, Brit. Assoc. Report, pp. 201-207. 



1872. E. Roberts, Report of same Committee, Brit. Assoc. Rejyort, pp. 355-395. 



1876. Sir W. Thomson, Report of same Committee, Brit. Assoc. Report,TpTp. 276-307. 



1878. Capt. Evans and Sir W. Thomson, ' On the Tides of the Southern Hemi- 

 sphere and of the Mediterranean,' Brit. Assoc. Report, pp. 477-481. [Nature, 

 v. 18, pp. 670-672.] 



Sir W. Thomson, ' Harmonic Analyser,' Proc. Roy. Soc, v. 27, pp. 371-373. 



1881. Sir W. Thomson, 'The Tide Gauge, Tidal Harmonic Analyser and Tide 

 Predicter,' Proc. Inst. Civil Engrs., v. 66, pp. 2-26. 



1882. G. H. Darwin, ' On the Method of Harmonic Analysis used in deducing the 

 numerical values of the Tides of Long Period . . . ,' Brit. Assoc. Report, 

 pp. 319-327. 



1883. G. H. Darwin, 'Report of a Committee for the Harmonic Analysis of Tidal 

 Observations,' Bnt. Assoc. Report, pp. 49-118. \_Sci. Papers, v. 1, pp. 1-68.] 



1884. G. H. Darwin, Second Report of same Committee, Brit. Assoc. Report, 

 pp. 33-35. 



1885. G. H. Darwin, Third Report of same Committee, Brit. Assoc. Report, pp. 35-60. 

 [Sci. Papers, v. 1, pp. 70-96.] 



A. W. Baird and G. H. Darwin, 'Results of the Harmonic Analysis of Tidal 

 Observations,' Proc. Roy. Soc, v. 39, pp. 135-207. 



1886. G. H. Darwin, 'Fourth Report of Committee for Harmonic Analysis . . ,' 

 Bnt. Assoc. Report, pp. 41-56. [Sci. Papers, v. 1, pp. 98-116.] 



* For Brit. Assoc. Reports, the dates are those of the meetings to which the 

 volumes refer ; in other cases the dates are those of publication. 



