394 



WATER-TRANSPORT. 



dovetailed or merely let-iu, are placed at intervals of about one 

 foot-meter-gauge sleepers with the broad face horizontal. In the 

 centre are two planks placed longitudinally and serving as a 

 foot way. A wire rope runs along each side, and is tirmly fixed 

 to the broad-gauge sleepers. This is to give the boom tiexi- 

 bility against sudden strains. Below the sleepers are three iron 



Fig. 235. 

 DAGHPATHUR BOOM .SraU 



Support 



Iron rndn-ZCir. 

 I-ron roda-i'CiTl 



eUEVATION (np~»trfinm ed^e of Boom) 



3 



Drawn by A. G. Hubait-HampJen. 



rods one inch in girth supported by bars two inches in girth from 

 the broad-gauge sleepers. 



This boom cost Rs. 1150, including Es. 500 for wire ropes 

 which last for many years ; it is annually removed before the 

 July monsoon, and replaced in October. About 400,000 sleepers 

 and scantling are stopped by it annually and made-up into rafts 

 at Daghpathar. — Tr.] 



(b) Modes of using Booms. — According to the strength of the 

 stream, the purpose for which they are erected, but above all on 

 account of their suitability for any particular localit}', various 

 kinds of booms are used. Here, in the first place, a distinction 

 must be made according as the booms are used, either to stop all 



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