40 J. Waterliousc — An Account of the Tidal [No. 1, 



High-water occurs at Nawanar Ih. 5m. after Okha. 

 „ Hanstal 1 40 „ 



Low-water occurs at Nawanar 1 36 „ 



„ Hanstal 2 53 „ 



The results obtained from the combined tidal and leveling operations 

 show that the mean sea-level is higher bj 7 inches, at the head of the Gulf, 

 and by 4 inches, midway up, than it is at the mouth of the Gulf. 



The curves of the self -registering aneroid barometers were compared 

 four times daily with a mercurial barometer, and the differences met with — 

 after allowing for index errors — were usually so trivial and unimportant 

 that every confidence may be felt in the general accuracy of the curves. 

 The aneroids are of a delicate construction and are liable to get out of order, 

 but as spare ones were available, no break of importance occurred at either 

 station. 



The anemometers were less satisfactory in their working, probablj' be- 

 cause they were so much more exposed to the vicissitudes of the weather. 

 The long continuance of winds coming from the same quarter caused the 

 direction gear to clog, and until this was discovered the recorded directions 

 are to some extent incorrect. On the other hand, the velocity gear was 

 kept in constant action by the strong winds prevailing. Several severe 

 gales were recorded. The greatest velocities registered in 24 hours were — 



620 miles at Okha on the 20th June, 1874. 



890 „ Nawanar „ 26th „ 



1130 „ Hanstal „ 5th August, „ 



On the latter date the anemometer of Hanstal recorded 270 miles in 

 the three hours between 2 a. m. and noon. Capt. Baird is not entirely 

 satisfied with the performances of these instruments ; but, considering their 

 small size (for the sake of lightness and portability), and their exposure to 

 fierce winds, to rain and, worse than all, to the constant oxidising influence 

 of the sea, Colonel Walker thinks it improbable that any instruments would, 

 under similar circumstances, have given much better results. 



The total rainfall during the monsoon of 1874, as registered by the 

 rain-gauges set up at each station, was — 



10' 75 inches at Okha. 



13'61 „ Nawanar. 



18-40 „ Hanstal. 



21-91 „ Eajkot (40 miles inland). 



It will be seen that, a greater range of tide, a greater velocity of wind 

 and a greater rainfall, have been registered at the head than at the mouth 

 of the Gulf, and intermediate values at the midway station of Nawanar. 



The scientific value of the observations is greatly increased by the con- 

 temporaneous observations of the barometric pressure, the velocity and direc- 



