needed to conduct the coring program for a 

 survey cruise). One jar is needed for each 

 sample. The sediment retained by the core 

 catcher and cutting edge is stored in a sample 

 jar. 



9. Glass wool, used to pack the unfilled 

 portion of the plastic liner above the core 

 sample. 



10. Shackles, used to attach the trigger line 

 to the release arm. 



6-31 Tools Needed to Operate the Kullen- 

 berg Piston Corer. — In order to assemble and 

 operate the Kullenberg piston corer, the fol- 

 lowing tools are needed: 



1. Pliers, 8-inch combination. 



2. Pipe wrench. 



3. Adjustable end wrench. 



4. Allen wrench, one-fourth inch. 



5. Screwdriver. 



6. Small saw or sharp knife, for cutting liners. 



7. Wire brush, circular, with long handle. 

 A boiler-tube-type wire brush, with a metal 

 handle, for cleaning the inside of the coring 

 tube is recommended. 



8. Steel wool. 



9. Oil can. 



10. Cleaning rags. 



6-32 Assembling the Kullenberg Piston 

 Corer for Operation. — The mainweight consists 

 of 4 to 6 cast lead drive weights which are placed 

 in position on the upper end of the main body 

 tube. These weights weigh 50 pounds each 

 and are held in place by a cap or cable sling. 

 A coring tube is attached to the mainweight by 

 means of three Allen-head setscrews. The 

 plastic liner is next inserted into the coring tube 

 until it is flush with the piston stop collar in 

 the mainweight. Scratch a mark on the liner, 

 flush with the end of the coring tube, and pull the 

 liner out a distance of one-fourth inch to aUowfor 

 the seating of the core catcher and cutting 

 edge. Cut the liner to this length. If the liner 

 is too long, it will not be possible to seat the 

 core catcher and cutting edge. If it is too short, 

 there may be vertical play between the liner 

 and coring tube resulting in possible loss of 

 some of the bottom sample when removing the 

 liner. The length of the liner is 5 feet 9% inches 

 when a 5K-foot coring tube is used and 11 feet 

 9% inches when an ll^-foot coring tube is used. 



Now feed the lowering cable through the 

 upper end of the mainweight and the liner until 

 it extends out the lower end of the coring tube. 

 Attach the cable to the swivel fitting on the 

 piston. Insert the piston into the coring tube 

 about 3 inches above the end of the tube. It 

 must just clear the core catcher. Insert the core 



60 



catcher and cutting edge and secure the latter 

 with Allen-head setscrews. 



6-33 Rigging the Release Mechanism. — 



Insert the baU of the corer into the slot in the 

 release mechanism so the release arm is able to 

 support the full weight of the corer. As soon as 

 this is done, it is important to insert the safety 

 pin. Clamp the lowering wire on the side of 

 the releasing mechanism, leaving from 4 to 6 

 feet of slack in the wire depending on the 

 amount of free fall desired. This bight of wire 

 between the top of the corer and the clamp of 

 the release mechanism is taped in order to 

 prevent kinking. Fasten the trigger weight line 

 to the end of the release arm with an overall 

 length equal to the total length of the coring 

 device plus the amount of slack in the wire 

 between the release mechanism and the top of 

 the corer. For a free fall drop of 4 to 6 feet, 

 the length of the trigger line and weight will 

 be 17 feet if using a 5)^-foot coring tube, and 

 23 feet if an ll^-foot coring tube is used. 



6-34 Rigging for Lowering. — The methods 

 for suspending the Kullenberg piston corer 

 over the side will vary with the type of ship 

 being used for the operation. On a ship equipped 

 with a large enough boom, the corer may be 

 hoisted until it is entirely supported by the 

 lowering cable before swinging the gear out- 

 board. If an A-frame is used, it is suggested 

 that a cradle be suspended outside the lifelines 

 in which the corer can be secured and rigged 

 while at sea. From such a cradle the corer can 

 be lowered to a vertical position from the 

 A-frame with handling lines. After the corer is 

 suspended over the side in a vertical position 

 from the lowering wire, check to see that the 

 trigger weight and line is hanging properly and 

 the corer is hanging correctly from the release 

 mechanism. Important — now remove the safety 

 pin from the release arm. Lower the assembly 

 to the water's edge and set the meter wheel 

 to zero. Commence lowering. 



6-35 Obtaining the Core. — The method for 

 obtaining the core is similar to that outlined 

 in section 6-18 for the Phleger corer. However, 

 a heavier spring scale must be used than that 

 used for the Phleger. In shallow waters and 

 without a spring scale, contact with the bottom 

 may be detected fairly reliably by a slack in the 

 wire and a jerk in the meter wheel. For deep- 

 water operations the use of a dynamometer is 

 recommended. The type of dynarnometer used 

 on Navy survey ships is a device with two fixed 

 sheaves at a given distance; between them is a 

 movable sheave upon which the lowering wire 

 exerts a pressure. The movable sheave is at- 

 tached to a coU spring and variations in wire 



H. O. 607 



