658 



Troceedlng^ of the Royal Irish Academy. 



Comparison of Tides from June 17 to June 29, 1882, at Fleet wood, and 

 confirmed hj Registers at Liverpool. 



Date. 



Calculation. 



Obsen-ation. 



Error. 



1 



! Barometer. 



Wind, &c. j 



1882. 

 June 17. 



ft. in. 

 26 



ft. in. 

 25 7 



in. 

 — 5 



I 



1 ^°- 



: 29-9. 



TV.S.V., sHght. 



„ 18. 



26 4 

 25 7 



26 5 

 25 6 



-f 1 

 -1 



■ 29-6. 



W., fresh. 

 X.X.W., „ 1 



,, 19. 



25 9 

 24 11 



25 10 

 24 10 



+ 1 

 - 1 



29-8. 

 29-9. 



j 



„ 20. 



25 3 

 23 10 



25 2 

 23 11 



- 1 



-!- 1 



' yy 



,, calm, 



1 



1 „ 21. 



1 



24 2 

 22 10 



24 4 

 23 2 



-f 2 

 + 4 



, 29-8. 



5 J 



W.S.W., slight. ! 



1 ,; 22. 



„ 23. 



1 



23 3 

 22 1 



22 5 



21 1 



23 4 

 22 4 



22 5 

 21 5 



+ 1 

 4- o 







+ 4 



29-7. 



X., calm, 

 calm. 



,. 24. 



21 4 

 20 4 



21 5 

 20 9 



+ 1 



+ 5 



29-9. 

 , 29-8. 



S., fresh, bar. falling. 



: ,, 25. 



20 7 

 20 1 



20 11 

 20 4 



+ 4 

 + 3 



29-9. 

 30-0. 





„ 26. 



20 6 

 . 20 10 



20 8 

 20 10 



-f 2 

 



i .■! 



cahn. 



„ 27. 



21 3 

 21 11 



21 2 



22 



- 1 



+ 1 



30-1. 



X.X.W., slight. 



„ 28. 



22 3 



23 3 



22 3 



23 4 







+ 1 



30-2. 



S.W., calm. 



N., 



„ 29. 



23 6 



24 10 



23 4 



24 8 



_ 2 



- 



har. rising. ,, 



But, in order to submit the ne^vly-devised method to a still more 

 severe and crucial test, it is necessary to examine what may be called 

 correlative tides, i.e. tides having nearly the same constituents : for as 

 like causes produce like effects in natui-e, such tides should show the 

 same agreement between theory and observation. This plan becomes 

 more simple, because any one tide in any year has only one tide corre- 

 sponding to it in any other year ; and if there be a discordance, it must 

 be due to a difference in atmospheric conditions, and will indicate the 

 change of height of tide arising fi'om this cause. 



