Dredges.

The Priestman dredge mounted or its barge, is still in first-rate working condition, and is at present used to pull out snags and logs from the river bed. It is not nearly so efficacious as the ladder dredge for excavating gravel, but is generally found useful for dredging in confined positions, where the ladder dredge cannot work. No harbor of this description should be without one of this kind of dredge.