REPORT ON THE DEEP-SEA DEPOSITS. 
7 
the comb valve. It is screwed into A on the top of a thin leather washer to make the 
Fig. 12 . — The Dredge. 
A, A, arms of the dredge, connected together with iron .screw bolts B, B, B, and between them an iron tongue C, with 
a swivel-ring D at its upper end, to which ; the dredge-chain is fastened ; E, E, E, two knife-edged pieces of iron on 
the long sides of the framework, having an outward inclination of about 10° from the perpendicular ; F, sack of 
the dredge made of network of soft line, and lined inside with cotton cloth ; G-, G, iron bar, suspended by the ropes 
H, H, to the framework, and supporting the flat-headed swabs K, K, K, K, K. 
joint tight. At each sounding a sample of the mud and of the bottom water will be 
