1K78.] 



Observations in the GuJf of Cutch. 



31 



> disc 



two inches in diameter with copper inside, just 

 the same as the suction-pipe. It was provided 

 in lengths of 50 or 60 feet, and in smaller one 

 of 20 feet for temporary use only. The 

 lengths were fitted with couplings and unions 

 for connecting them with each other. 



Lengths of this suction-pipe were joined 

 on to the end of the iron piping in the 

 manner above described, and taken out to 

 deep water. At the end of the outer length 

 a copper rose, of about 15 inches in length, 2 

 inches in diameter, and having about 150 holes 

 of y\ of an inch bored in it, was screwed on. 

 This rose was sustained a few feet from the bot- 

 tom, being attached to a small 

 nun-buoy by a chain and sha^ckle 

 with swivel, the whole being held 

 in position in deep water by an 

 anchor. To the top of the small 

 nun-buoy a chain was attached, 

 to which was fixed the large buoy 

 floating on the surface, with 

 plenty of slack chain to allow for 

 rise and fall of tide, and this 

 buoy also served to mark the 

 position of the flexible pipe. 

 The arrangement will be under- 

 stood by reference to the annexed 

 figure. 



The level of the water in the well should obviously always coincide 

 with that of the sea, otherwise the registrations of the gaiige are worthless ; 

 it is therefore imperatively necessary to compare the inside and outside 

 levels from time to time, in order to remove all doubt as to the efficiency 

 of the communication between the well and the sea. For this purpose an 

 ordinary gauge was attached to a pile driven into the bed of the sea, and 

 its zero was connected with that of the self -registering gauge over the 

 well, by spirit levelling, and thus a comparison of the levels could be readily 

 made whenever desirable. On taking these comparisons during certain 

 trial observations at Bombay, Captain Baird was surprised to find that 

 while the levels were generally identical, there were occasional large differ- 

 ences which at first could not be accounted for ; eventually, however, he 

 succeeded in tracing them to the accidental presence of air inside the piping. 



