main body and secure them in place with the 

 collar. 



Step 10. Tape the bight of wire between corer 

 and release mechanism to the main body of the 

 corer to pre\'ent kinking or lianging up during 

 free fall (fig. I-/-6), I'emove the safety pin, lower 

 the assembly to the surface of the water, set the 

 meter wheel counter dials to zero, and commence 

 lowering the corer. NOTE: To rig the Kullen- 

 berg corer as a gravity corer do not use the pis- 

 ton assembly and substitute the following for 

 step 6 : Connect the free end of the lowering 

 wire to the bail, replace tiie core catcher and se- 

 cure the cutting edge with the set screws. Ad- 

 just the bight of wire between corer and release 

 mechanism accordingly. 



L-13 Obtaining the Kullenberg Piston 

 Core. — Lowering sliould be accomplished in ac- 



Fiffure L-6. Taping bight of lowering wire to 

 Kullenberg corer. 



ordnance with instructions in paragraph L-29, 

 Obtaining the Core. 



L-14 Retrieving the Kullenberg Piston 

 Corer. — As soon as the winch is stopped, note 

 the amount of wire out, and commence hauling 

 in immediately. The speed of the winch should 

 be slow until the corer is picked uj). During 

 hoisting, the piston supports the entire weight 

 of the corer. Do not increase the winch speed 

 until the sampling gear is well clear of the 

 bottom. 



Step 1. When the release mechanism is at deck 

 working level bring in the trigger weight and 

 remove the release mechanism from the wire. 



Step 2. Hoist the corer to deck working level, 

 remove drive weights, and bring corer aboard, 

 keeping the bottom end of the corer lower than 

 the main weight. 



Step 3. Measure the length of sediment on the 

 outside of the coring tube. Retain this measure- 

 ment for step 8 below. 



Step 4. Loosen the setscrews on the adapter 

 and remove the core tube with liner. 



Step 5. Loosen the setscrews on the cutting 

 edge, remove the cutting edge and push the liner 

 down far enough to allow removal of the core 

 catcher. Cover the end of the liner with a plastic 

 cajj. Tape the cap in place; then, remove the 

 liner from the core tube, keeping it in an up- 

 right position if possible. 



Step 6. With a saw, make a cut through the 

 plastic liner just above the top of the core sam- 

 ple. Let the water drain off slowly, then finish 

 cutting off the liner. Finally, cap the liner with 

 a plastic cap. Where the 12-foot liner is used, it 

 may be necessary to section the core for easier 

 handling; however, this is not desirable and 

 should be avoided if possible. 



Stej) 7. Put any sediment retained by the cut- 

 ting edge or the core catcher in a sample jar as 

 this sediment is the deepest layer penetrated. 



Step 8. Log the samples (core as one, jar as 

 one) on the Oceanographic Log Sheet-M ac- 

 cording to instiiictions given in paragraph 

 L-39, Oceanographic Log Sheet-M Bottom 

 Sediment Data. 



Step 9. Label samples according to instruc- 

 tions given in paragraph L-40, Labeling the 

 Bottom Sediment Sample(s). 



Step 10. If the liner used was CAB plastic, 

 coat it with wax according to the instructions 

 given in paragraph L-30, Applying Wax to 

 Core Sample Liners. 



Step 11. Pack, store, and ship cores in ac- 

 cordance with instructions given in paragraph 

 L-41, Packing, Storing, and Shipping Bottom 

 Sediment Samples. 



L-15 Maintenance of the Kullenberg Piston 

 Corer. — In general the Kullenberg corer re- 

 quires very little maintenance. The corer's stor- 

 age cases contain spare parts. If the core cutter 



L-7 



