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Updated: May 16, 2025
The dredger does not succeed very well in soft silt, because, owing to its slow precipitation, it runs over the sides of the hopper barges without settling. Nor does it do for dredging solid clay. It gives, however, excellent results with sand and gravel, and for this work is much superior to the bucket dredger.
When the necessity for more dredger-work developed, in order to keep the deep channel of the Skookum from filling, he had the pipes from the dredger run out to the Sawdust Pile and covered the unsightly spot with six feet of rich river-silt up to the level of the piling.
Peculiar difficulties have been encountered in establishing the foundations of the locks. The lowest of each flight are planted in deep morasses, and could only be settled by removing vast masses of estuary slime to a depth of 80 feet below sea-level. The sea was cut off and a dredger introduced, which gradually cleared its way down to the bottom rock.
But before the dredger was taken over by the company the alterations before enumerated had cost about L300, bringing the total for barge and dredger up to L2,100. In building a second dredger this might of course be greatly reduced. The cost of repairs for one month's working has been only L5.
All three are connected with the boiler. Water tanks below deck serve to trim the boat and furnish a supply for the boiler. The dredger cuts by swinging on a center spud 16 in. in diameter, and moves forward from 8 to 10 ft. at each fleet.
I mind young Bannister an' Calder shakin' hands on a bond to be revenged on the Board at ony reasonable cost this side o' losing their certificates. Now mark ye how false economy ruins business. Men will tak' a dredger across the Atlantic if they 're well fed, an' fetch her somewhere on the broadside o' the Americas; but bad food's bad service the warld over.
The sageer is merely a wheel of about twenty feet diameter, which is furnished with numerous earthenware jars upon its exterior circumference, that upon revolving perform the action of a dredger, but draw to the surface water instead of mud.
The otter trawl, the Agassiz trawl, the 'D' net, and the ordinary dredger. A word or two on the using of 'D' nets and then explanation of sieves for classifying the bottom, its nature causing variation in the organisms living on it.
Through perhaps hundreds of thousands of years, the skeletons continued to accumulate until beds were formed hundreds or even thousands of feet in thickness. The materials of the beds, at first a soft mass like the ooze which the dredger brings up from the bottom of the present ocean, became packed together in a solid mass. Then disturbances affected this old sea bottom.
The dredger and the three shielded derricks hadn't gotten into action yet. I circled around clockwise, dodging over, under and around the skids and lorries hauling wax out of danger. They were taking them into the section through which I had brought the jeep a few minutes before, and just dumping them on top of the piles of mineral nutrients.
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