PLATE 4 



9. The A-frame at its greatest extension, with the orange-peei- 

 grah still descending; the cable taut, shown diagonaJlv across 

 the picture. 



10. The grab loaded with a sample from the bottom, just after 

 breaking the surface of the water; the jaws are well closed 

 to prevent the loss of contents. 



11. The sample is hoisted through the A-frame and about to be 

 hooked to the chain and released from its cable, before it is 

 brought down. 



12. It is placed over its large retaining tub on the rear platform 

 of the rdero IV, and opened, to empty its contents in the tub. 



