408 



Table of the Times of High Water 



[Aim. 



From themean of 10 sets, similar to the above, the errors of division 

 for two opposite divisions are as follows : 



Error of and 180 



=0.00 



Error at 95 and 275 



=0.88 



5 



185 



—0.64 



100 



280 



—1.58 



10 



190 



—0.46 



105 



285 



—1.17 



15 



195 



+ 0.13 



110 



290 



— 1.48 



20 



200 



-j-0.45 



115 



295 



—1.77 



25 



205 



+ 0.61 



120 



300 



—1.57 



30 



210 



—0.26 



125 



305 



—0.66 



35 



215 



—0.56 



130 



310 



—0.96 



40 



220 



—0.29 



135 



315 



—1.39 



45 



225 



+0.05 



140 



320 



—1.33 



50 



230 



—0.12 



145 



325 



—1.75 



55 



235 



—0.80 



150 



330 



—2.15 



60 



240 



—1.00 



155 



335 



— 1.67 



65 



245 



—1.20 



160 



340 



— 1.20 



70 



250 



—1.30 



165 



345 



—0.46 



75 



255 



—0.69 



170 



350 



— 0.20 



80 



260 



—0.23 



175 



355 



+0.09 



85 



265 



—0.12 



180 



360 



—0.03 



90 



270 



—0.45 









I am not prepared at present to furnish the error of the divisions in- 

 termediate between the above, but I may remark that out of a great 

 many which / have examined, the largest error I have found does not 

 exceed that above found for 150° and 330°. 



VII. — Table of the Times of high water at the principal places between. 



Calcatta and Point Palmiras, prepared by Mr. P. G. Sinclair. 



We have much pleasure in giving insertion to the accompanying 

 table, which will be extremely useful not only to navigators here, but 

 also to the philosophers in Europe, who are now engaged in investigat- 

 ing the course of the tidal waves over the entire globe. We published 

 in vol. ii. p. 151, a list of Professor Whewell's desiderata regarding the 

 co-tides of the Indian ocean. His memoir on the cotidal lines is publish- 

 ed in the Trans. Roy. Society 1833, Pt. 1, and we there find that the 

 coasts of India present nearly a blank : the time of high water at Point 

 Palmiras differs two hours from the time given by Mr. Sinclair's ob- 

 servations. We hope to be furnished from our correspondents at 

 other places, such as Masulipatam, Madras, Chittagong, Kyook Phyoo, 

 Penang and Singapur with tables similar to the present, but we would 

 suggest that the other desiderata, of the lift of the tide — the esta- 

 blishment of the place, — the correction for other days of the semi-lunar 

 period, &c. should also receive the attention of observers. 



The present table must not be understood as rigidly correct, but 

 rather as an useful practical approximation ; for the intervals of retar- 



