. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. Fig. 200.—Ball Dredge.(After Wyville Thomson.) Fig. 201.—Agassiz Trawl,Blake Pattern. The beam trawl is towed by a pair of spans whichare shackled to eyes in the front of the heads. Eachspan should be three and a half or four times the lengthof the beam, and as stout as the warp. The head ropeof the net is as long as the beam, and is laced to it. THE BEAM TRAWL 297

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912