Socket wrench set with ratchet liandle ; 



Adjustable end wrench ; 



Small saw ; 



Pipe wrench with ;5-inch jaw. 



Step 1. Place the mainweight in a horizontal 

 position on the deck or in a cradle, and secure 

 a connector sleeve to the end of the main body 

 tube. 



Step 2. Insert and secure a coring tube into 

 the connector sleeve. 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 se- 

 cure another lengtli of coring tube, etc. Up to 

 three 20-foot coring tubes can be used. It is very 

 important to bolt every hole in the connector 

 sleeve. 



Step 3. Insert a 20-foot length of plastic liner 

 for each coring tube used. The plastic liner 

 should be 2.45-inch outside diameter, 2.38-inch 

 inside diameter, polycarbonate resin (or equal) . 



Step 4. Attach a suitable fitting to the end of 

 the lowering wire (a Fiege fitting is commonly 

 used), and thread the lowering wire through 

 the main body tube and the coring tubes. 



Step 5. Attach the piston to the lowering wire 

 fitting, and connect the piston stop collar to the 

 wire just above the piston. The stop collar con- 

 sists of two disks that are held together with 

 screws. It prevents tlie piston from passing 

 through the main body tube and supports the 

 entire weight of the corer during retrieval. 



Step 6. Apply a light coat of oil to the leather 

 washers on the piston, and pull the piston back 

 into the coring tube, leaving just enough space 

 for the core catcher. 



Step 7. Insert the core catcher and secure the 

 cutting edge in place. Place setscrews in all holes 

 in the cutting edge to insure suction for the 

 piston. 



Step 8. Attach the wire clamp of the release 

 mechanism onto the lowering wire 10 feet above 

 the tailfin assembly. This free-fall distance can 

 be increased if desired. Insert the bail into the 

 slot of the release mechanism, and insert the 

 safety pin into the release arm. 



Setp 9. Assemble the trigger weight gravity 

 corer. 



Step 10. Attach the trigger line to the trigger 

 weight corer and the end of the release mech- 

 anism arm so that the weight will be suspended 

 the free-fall distance below the cutting edge of 

 the corer. 



Step 11. Using the boom or crane, hoist the 

 corer over the side. If the corer has no lifting 

 ring, splice a wire rope sling above and below 

 the lead drive weights. Lower the coring tube(s) 

 into the water with lowering lines, and pay out 

 the boom until the entire coring assembly is 

 suspended vertically from the lowering wire. 

 Lower the trigger weight into the water, check 

 that all lines are tending properly (fig. L-8), 



remove the safety pin from the release mecha- 

 nism, lower the corer to the surface of the water, 

 set the meter wheel counter dials at zero, and 

 commence lowering. 



Figure L-S. The Ewing corer. 



L-18 Obtaining the Ewing Piston Core. — 



Lowering should be accomplished in accord- 

 ance with instructions in paragraph L-29, Ob- 

 taining the Core. 



L-19 Retrieving the Ewing Piston Corer. — 



As soon as the winch is stopped, reverse controls 

 and commence hoisting. During the pull-out, 

 that period when the corer is being pulled out 

 of the bottom, watch the dynamometer for ten- 

 sion changes. Have all hands stand clear of the 

 wire. Be ready to stop the winch if tension ap- 

 pears excessive. Normally, the tension will in- 

 crease ai^proximately 2,000 to 4,000 pounds 

 during pull-out. 



L-9 



