326 



Tides at Madras. 



[June, 



were frequently interrupted ; but that after that date, they were made 

 daily, at every tids, in every 24 hours : and as there appears some 

 difference in the results obtained from the subsequent period, they are 

 given in the following statement." 



Circumstances of the Tides from 29th July to 10th October, 1821, both inclusive. 









Surface of the 



Water 



below 



the 



Difference 



Age of the Moon. 



Time of High 



W» to.. 





Gauge 



■ mark 







between high 

 and low water 

 aark. 



TV 



U.L.V/1 * 



H. 



W. 



L. 



W. 



1 Mean. 





h. 



m. 



ft. 



in. 



ft. 



in. 



ft. 



in. 



ft. in. 



Full and Change. 



8 



54 



5 



4* 



8 



4§ 



6 



iof 



2 Hi 



2nd — 16th,.. 



9 



24 



5 



o§ 



8 



4§ 



6 



8f 



3 3| 



3rd — 17th,.. 



9 



54 



4 



iH 



8 



3 



6 



71 



3 3| 



4th — J 8th,.. 



10 



24 



5 



oh 



8 



2 



6 



7 



3 11 



5th — 19th,.. 



11 







4 



10* 



8 



1 



6 



5| 



3 2§ 



fith — 20th,.. 



11 



42 



4 



HI 



8 



2 



6 



6| 



3 2£ 



7th — 21st,.. 



12 



12 



5 



3§ 



7 



11| 



6 



7| 



3 8| 



fcth — 22ud,.. 



12 



50 



5 



4f 



7 



9§ 



6 



7 



2 5 



9th — 23rd,. . 



1 



21 



6 



o§ 



8 



Of 



7 



o| 



2 0§ 



10th — 24th,.. 



3 



6 



6 



*i 



8 



H 



7 



3 



1 8$ 



11th — 25 th,.. 



4 



24 



6 



6 



8 



4 



7 



5 



1 10 



12th — 26th,.. 



5 



24 



6 



7 



8 



5* 



7 



H 



1 10§ 



13th — 27th,.. 



6 



18 



6 



4 



8 



43 



7 



H 



2 0| 



14th — 28th,.. 



6 



48 



5 



10$ 



8 



n 



7 



of 



a 4f 



29th,.. 



7 



37 



5 



5 



8 



H 



6 



9i 



2 8| 



Average level and 



lift, 





5 



6h 



8 



H 



6 



J Of 



2 7| 



" Although this statement appears less anomalous than the last, in 

 some respects, it is not so in all ; and as the other has the advantage 

 of including the period of the long shore winds and strong southerly 

 currents, it is a better average for the whole season than the last." 



[Note. — It would have been more satisfactory if the state of the moon's decli- 

 nation, parallax, &c. had been attended to in the period selected for the above 

 observations. Still, however, the table will be useful, as a reply tanti to the 

 desiderata of the Rev. Professor Wheweu, regarding tides on our Indian, coasts, 

 which was published in the first volume of the Journal. We wish we had similar 

 information from other points on the coast, and especially from the other side 

 of the Bay ; and we cannot let the present opportunity pass of bringing the sub- 

 ject to the notice of our friends at Chittagaon, Rarnri, Moulmein, Penang, and 

 Malacca. A single period of a complete lunation, carefully observed as to the 

 direction, velocity, rise, and precise time of the day, and night tides, noting also 

 the time of the moon's meridional passage, would be useful, and would cost but 

 little trouble. All who have seen Professor Whewell's laborious map of the tidal 

 wave, traced in its course over the whole surface of the globe, in the last volume 

 of the Transactions of the Royal Society, would, we are confident, willingly con- 

 tribute to the perfection of so interesting and useful a problem.— Ed.] 



