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A TREATISE ON DREDGES AND DREDGING 



DREDGE "PERCY SANDERSON." RECORD OF TIME WORKED AND 



QUANTITY DREDGED 



COST OF DREDGING, INCLUDING REPAIR'S AND MAINTENANCE OF 



DREDGE 



(Quantity dredged 1894-99, 1,790,736 cu.yds.) 



d. 



Dredging: Coal and stores 0.81 \ 



Crew and wages 1 . 24 / 



Repairs, etc.: Coal and stores 1 .02 1 



Crew and wages 1.15J 



d. 

 2.05 



2.17 



Total per cubic yard dredging and repairs 4 . 22 



Interest, depreciation, and insurance not included. 



The marine dredge " Percy Sanderson/' built by Messrs. William 

 Simons & Co. of Renfrew, is 220 ft. long, 40 ft. broad and 17 ft. 2 

 in. deep. The hopper carries 1250 tons. The 30 buckets have each a 

 capacity of 21 cu.ft. and the machine can dredge to a depth of 35 ft. 

 The dredge is propelled by two sets of triple-expansion surf ace-condens- 

 ing engines of 1250 indicated horse-power combined, driving twin 

 screws, and giving a speed of 8 knots when the vessel is fully loaded. 



The dredge worked from sunrise to sunset; by preference only dur- 

 ing the summer months, but also in winter when absolutely necessary. 



When dredging in soft clay, six loads per day were generally 

 dredged and discharged at a distance of three nautical miles. The 

 daily time record being: per Load 



Hrs. Min. 



Dredging 1 



Transport 1 10 



Mooring and unmooring 30 



Six loads at 2 hours and 40 minutes 16 



From and to anchorage 30 



19 10 



