same as used for the Phleger corer. They are 

 assembled in the same manner as given in 

 section 6-15 for the Phleger corer. 



6-44 Spare Parts Needed for the Ewing 

 Piston Corer. — The following spare parts are 

 needed to operate the Ewing piston corer: 



1. Coring tubes. Enough coring tubes, 

 drilled and tapped for bolts and with caps on 

 each end, to conduct the coring program for a 

 survey cruise. 



2. Piston and Fiege fitting. One extra. The 

 Fiege fitting must be for the size of wire to be 

 used. 



3. Piston leather washers. Eight extra. 



4. Piston-stop collar, with screws. One 

 extra. 



5. Connector sleeves. Four extra. 



6. Metal spacers. Five extra. 



7. Stainless steel bolts. One gross. 



8. Core catcher. Four extra. 



9. Cutting edge. Four extra. 



10. Trigger weight and coring tube assembly. 

 One extra. 



11. Phleger parts for trigger weight corer: 



a. Plastic liner (enough for coring 

 program). One liner is used for each 

 sample. 



b. Rubber stoppers, size No. 7 (enough 

 for coring program). Two are used for 

 each sample. 



c. Core catcher. Four extra. 



d. Cutting edge. Four extra. 



12. Bottom sample jars. Enough K-pint 

 sample jars, as needed to conduct the coring 

 program for a survey cruise. One jar is needed 

 for each Ewing core sample. The sediment 

 retained by the core catcher and cutting edge 

 is stored in a sample jar. It is not necessory to 

 do this for the trigger weight core. 



13. Rags. These are needed to pack the 

 unfilled portion of the coring tube to prevent 

 disturbance of the sediment. They are also 

 needed for cleaning purposes and general 

 maintenance of the corer. 



14. Waterproof tape, which is used to secure 

 the metal caps onto the ends of the coring tubes. 

 The caps must be sealed to retain the moisture 

 in the sample. 



6-45 Tools Needed to Operate the Ewing 

 Piston Corer. — In order to assemble and 

 operate the Ewing piston corer, the following 

 tools are needed: 



1. Pliers, 8-inch combination. 



2. Screwdriver, medium size. 



3. Screwdriver, large size. 



4. Socket wrench set with ratchet handle. 



5. Adjustable end wrench. 



6. Small saw or sharp knife for cutting trigger 

 core plastic liners. 



7. Oil can. 



8. Steel wool. 



6-46 Assembling the Ewing Piston Corer 

 for Operation. — To assemble the mainweight, 

 first place a heavy steel disk, 8 to 10 cast lead 

 drive weights, and another heavy steel disk 

 over the main body tube up to the tailfin 

 assembly. Secure the disks and weights by 

 placing a connector sleeve over the end of the 

 main body tube and bolting it in place. When 

 less than ten weights are used, it is necessary 

 to use spacers in place of the missing weights. 

 These spacers are placed between the Tower disk 

 and the connector sleeve. Next, insert a 20- 

 foot length of coring tube into the connector 

 sleeve attached to the bottom of the main- 

 weight and secure it with bolts. It is very im- 

 portant to bolt every hole in the connector 

 sleeve to insure suction for the piston. If 

 more than one length of coring tube is to be 

 used, bolt another connector sleeve at the end 

 of the tube, and insert and bolt the next length 

 to it. 



Attach the Fiege fitting securely to the end 

 of the lowering wire and insert the wire into 

 the end of the main body tube at the tailfin 

 assembly. Push the wire through the coring 

 tube until it extends out the end of the tube. 

 Attach the piston stop collar onto the cable 

 above the Fiege fitting. Attach the piston to 

 the Fiege fitting. Insert the piston into the 

 coring tube until it is just above and clear of 

 the core catcher. Insert the core catcher into 

 the end of the coring tube and secure by fitting 

 the nose piece over it and the end of the tube. 

 Bolt the cutting edge in place. Some cutting 

 edges do not cover all holes in the end of the 

 tube. When using this type of cutting edge 

 be sure to fill all exposed holes with bolts to 

 insure suction for the piston and prevent dis- 

 turbance of the sediment layers. 



6-47 Rigging the Release Mechanism. — 

 Attach the wire clamp of the release mechanism 

 onto the wire 15 feet beyond the end of the 

 tailfin assembly. The wire clamp is a modified 

 wire rope stopper, or come-along. Shackle the 

 wire clamp to the top ring of the release 

 mechanism. Now insert the ring attached to 

 the bail of the tailfin assembly into the slot of 

 the release mechanism so that the release arm 

 is able to support the fuU weight of the corer. 

 As soon as this is done, it is important to 

 insert the safety pin into the release arm. 

 There are now about 12 feet of slack wire be- 

 tween the corer and the release mechanism 

 for free fall. 



H. O. 607 



63 



