288 



E, 



EEPORT 187G. 



fi. Speed 2(y — 2(T+?j). 



E, 



1858-59. 



0-0907 



6°-57 



1859-60. 



0-0951 



342°-4o 



MS. Speed (4y-2(T-2»y). 



1858-59. 



0-0454 



i2i°-48 



K, 



1859-60. 

 0-0388 



i4o°-42 



1860-61. 



0-0447 



ii2°-73 



R. Speed (2y-)j). 



1859-60 and 1860-61. 

 0-0082 

 258°-78 



E, 



^2 



1860-61. 

 0-0549 



20°-I0 



2SM. Speed (2y+2(r-4ij). 

 , * , 



1858-59. 1859-60. 1860-61. 



0-0326 0-0332 0-0087 



3i5°-68 3o°-i9 227°-66 



T. Speed (2y-3)j). 



1859-00 and 1860-61. 



0-1403 

 279°-83 



Long-period Tides. 



Speed 



1858-59. j-^ 

 1859-60. 1^ 

 1860-61. I 



.... (T. 

 ft. 

 0-075 



23°-53 



0-135 



175°75 



0-139 



79°-i9 



2<T. 



ft. 



0-052 



19°°'34 



0-053 



222°-34 

 0-073 



i58°-62 



2ie-n). 



ft. 



0-131 

 7o°-88 



0-131 

 S7°-35 



o"i4i 

 "55 



S4°- 



V- 

 ft. 



0-217 

 257°-63 



0-366 



200'-'-02 

 0-213 



i99°-69 



(From mean of 3 years.) 



ft. 



0-004 

 275°-4o 



0-138 

 io5°-65 



0-149 

 286°-62 



Coincidence of phase of S and M. 

 Coincidence of phase of P and O. 

 Coincidence of phase of M and N. 

 Opposition of phase of L and M. 



Ai'ter New or Full Moon. 



days. 



1-7391 



5-7762 



._£ _ I After moon's perigee. 



The results of the three years' reductions agree, on the -whole, well 

 together. The following small components, however, are somewhat discordant, 

 viz. the elliptic diurnal tide J, the smaller component of the evcction semi- 

 diurnal tide A, and the luuisolar compound semidiurnal tide 2SM. 



The good agreement hetwcen the separate determinations of the mean sea- 

 level renders Hartlepool a favourable place for the purposes of trigonometrical 

 survey, the annual tide also being much less in amount than at Liverpool, 

 to the mean sea-level of which the present survey of the United Kingdom is 

 referred. 



The values of the diurnal components are as largo as those for Liverpool, 

 where the mean solar and lunar semidiurnal tides ar«5 nearly double the values 

 of those for Hartlepool, and arc the largest yet evaluated for English ports. 



The value of the smaller elliptic semidiurnal tide (L) agrees very nearly 

 with the equilibrium-theory value of the values of this component for other 

 English ports, being considerably in excess of the theoretically assigned value. 

 The larger component (N) agrees exactly with that deduced from theory. 



A remarkable point in the deductions is the smallness of the ovortides of 

 the chief semidiurnal tides, and also of the compound luuisolar quarter- 

 diurnal tide (MS), which have been well marked in the other English ports 

 of which the observations have been analyzed. 



There is scarcely sufficient agreement between the results deduced from 



