This dredger raised about 30 tons per hour at the cost of 2d.
The dredger and the three shielded derricks hadn't gotten into action yet.
In building a second dredger this might of course be greatly reduced.
The conditions laid down for this dredger were that it should float in 18 in.
Jack Harvey, who had long ere this learned the necessity of quick obedience aboard the dredger, ...