20 A TREATISE ON DREDGES AND DREDGING 



distance of length of ship channel completed in that time. As the 

 cross section of the cut was practically uniform and the material 

 blue clay, which remains permanently in place, the work of the dredge 

 could thus be arrived at with a fair degree of accuracy. The quantity 

 stated is increased to scow measurements to compare w r ith the other 

 dredges on the same work which load into scows, on the basis of 

 place measurement being SO per cent of scow measurement. 



