1x5
Fia. 6. Above, conical dredge fitted with canvas ha&. Length of frame 86 cm, diameter
13elow, rect.airgular drodge, tlistorttd by rock-dredging, and without arms,
((‘nl~yright Satiorial Institute nf Oreanoof mouth 43 rm, weight 22 kg. (Photo: P. F. Ihiwles, 13rixharn.)
showing hag of wire rope groininefn.
graph?.)