60 



J. Waterhouse — An Account of the Tidal 



[No. 1, 



The present appears to be a good opportunity for giving the tidal 

 constituents which were calculated by Mr. Eoberts for the Port of Tuticorin, 

 from observations taken there in the year 1871-72, by Captain Branfill, 

 with a self -registering tide-gauge similar to those employed in the Gulf of 

 Cutch. 



Short -period Tides at Tuticorin, and their Constants. 



Star S 



Feet. 



fi?, =0-039, €, = 108-78 



i?2 =0-429, €2= 95-59 



i2^=0073, €4=282-65 



= 0003, €6= 51-34 



StarP 

 „ J 



StarM... 



Star O 



K 



Q 



L 



Feet. 



i2, =0-061, €,=281-78 

 i?, =0-011, €, = 181-70 

 i?, =0-274, €,=132-80 



|i?,=0 



143, 



116-25 



i2, =0-032, €2 = 359-08 



R 



N 

 A 



„2SM.. 



B. 

 B' 



:0-030, 

 :0-072, 



MS 



=242-50 



= 38-69 



0019, €2=248-45 



2=0-022, €2= 35-58 



i?2 =0-016, €2=183-83 



i22=0011, €2=246-37 



i?4=0-018, €^=282-99 



€ =313-15 

 „ 69-54 

 „ 307-85 

 „ 313-35 

 „ 87-50 



\B,=0 



Li^s =0-007, €8=262-75 



'i2, =0-006, €,=234-64 

 i^a =0-596, €2= 55-81 

 i^3=0015, €3 = 182 86 

 i24=0022, €^ = 192-76 

 i^6=0010, €6= 45-91 

 -2^8=0 004, €8=319-74 



...i?, =0-112, €, = 314-25 



Long-period Tides at Tuticorin, and their Constants. 



Feet 



Lunar monthly ... ... 72=0024 



Lunar fortnightly ... ... „ 0-065 



Luni- solar fortnightly ... ... „ 0*016 



Solar annual ... ... „ 0399 



Solar semi-annual ... ... „ 0*080 



Here there were no data for evaluating the atmospheric tides separately, 

 and it is probable that the magnitude of the amplitude of the solar annual 

 tide is in great measure due to atmospheric influences. 



Peogramme of Fftuee Opeeatioi^"S. 



The following important orders on the systematic record of tidal 

 observations at selected points on the Coasts of India, were issued by the 

 Government of India in the Department of Eevenue, Agriculture, and Com- 

 merce, under date 4th July, 1877 : — ■ 



" The Governor General in Council observes that the great scientific ad- 

 vantages of a systematic record of tidal observations on Indian coasts have 

 frequently been urged upon, and admitted by, the Government of India. 

 Hitherto the efforts in the direction of such a record have been desultory, 

 and in many cases wanting in intelligent guidance and careful selection of 

 the points where the observations should be recorded. Additional import- 

 ance has recently been given to the subject by the institution of a Marine 

 Survey Department, for whose operations accurate tidal observations are a 



