Step 5. Reinsert liner; insert core catcher; 

 and securely attach core cutter to the bottom 

 of coring tube, with bayonet fitting. Liner 

 should fit with no play. 



Step 6. With shackles, attach one end of the 

 chain to the corer bail and the other end of the 

 chain to the release mechanism. 



Step 7. With shackle, attach the release mech- 

 anism to the end of the lowering wire. 



Step 8. Secui'e one end of the trigger line to 

 the trigger weight and the other end to the re- 

 lease mechanism arm. 



Step 9. Insert the corer bail into the slot in 

 the release mechanism, and insert the safety 

 pin. 



Step 10. Gather the chain in several small 

 coils and fasten it to the bail with sail thread. 



Step 11. Svispend the coring assembly over 

 the side. Check to see that the trigger line and 

 weight are hanging properly, 7'em-ave the safety 

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

 set the meter wheel counter dials to zero, and 

 commence lowering. 



L-7 Obtaining the Phleger Core. — Lowering 

 should be accomplished in accordance with in- 

 structions in paragraph L-29, Obtaining the 

 Core. In very deep water, the weight of the 

 Phleger corer is often a small fraction of the 

 total weight of the lowering v^ire and of vari- 

 able loads caused by the roll of the ship; hence, 

 no apparent release in tension may be observed 

 when bottom is reached. 



L-8 Retrieving the Phleger 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 mitil the 

 corer is picked up. Do not increase winch speed 

 until the sampling gear is well clear of the bot- 

 tom, and then exercise caution as the corer ap- 

 proaches the surface. When bringing the 

 Phleger corer aboard, keep it in a near vertical 

 position. 



L-9 Removing, Logging, and Labeling the 

 Phleger Core. — When the Phleger corer is 

 aboard, remove the core, and log it in and label 

 as follows: 



Step 1. Measure the length of sediment on 

 the outside of the coring tube. Retain this meas- 

 urement for step 6 below. 



Step 2. With the coring device still in a near 

 vertical position, unscrew the coring tube from 

 the main weight, and remove the coring tube 

 and liner from the main weight. 



Step 3. Remove the cutting edge from the 

 coring tube, push the liner out of the coring 

 tube, remove the core catcher, and cover the 

 bottom end of the liner with a plastic cap, be- 

 ing careful to keep the sample in the liner. 



Step 4. Put any sediment retained by the 

 cutting edge or the core catcher in a sample 



L-4 



jar as this sediment is the deepest layer 

 penetrated. 



Step 5. With a saw, make a cut through the 

 plastic liner just above the top of the sample. 

 Let the water drain off slowly, then finish cut- 

 ting of the liner, keeping the core in a near ver- 

 tical position. Finally, cap the liner with a plas- 

 tic cap. 



Step 6. Next log the samples (liner as one 

 and jar as one) on the Oceanograpliic Log 

 Sheet-M according to instiiictions in paragraph 

 L-39, Oceanographic Log Sheet-M Bottom 

 Sediment Data. 



Step 7. Label the samples according to in- 

 structions given in paragraph L-40, Labeling 

 tlie Bottom Sediment Sample (s). 



Step 8. If the plastic liner used was (CAB), 

 coat liner with wax according to the instruc- 

 tions given in paragraph L-30, Applying Wax 

 to Core Sample Liners. 



Step 9. Pack, store, and ship cores in accord- 

 ance with instructions given in paragraph L-41, 

 Packing, Storing, and Shipping Bottom Sedi- 

 ment Samples. 



L-10 Maintenance of the Phleger Corer. — 



In general, the Phleger corer requires very little 

 maintenance, but each corer's storage cases con- 

 tain spare core tubes, core catchers, and cutting 

 edges. After each lowering, all sediment should 

 be removed from the corer by washing, and any 

 damaged parts should be replaced. The core- 

 catcher springs are delicate and must be in- 

 spected for free play action, and the core cutter 

 may be dented if the core hits a hard or rocky 

 bottom. When the coring operation is com- 

 pleted, any sediment on the corer should be re- 

 moved by washing, and the entire device should 

 be rinsed in fresh water, and stored in the core 

 assembly shipping cases. 



L^ll The Kullenberg Piston Corer.— The 



Kullenberg piston corer used at the U.S. Naval 

 Oceanogi-apliic Office is a modified version of 

 the original Kullenberg corer which was de- 

 signed to obtain cores up to 65 feet in length. 

 The modified Oceanographic Office model dif- 

 fers from the original not only in the assembly 

 but also in the manner in which it is employed. 

 Throughout the remainder of tlie chapter, all 

 references to the Kullenberg corer will be un- 

 derstood to mean the model developed by the 

 Oceanographic Office and not the original. The 

 Kullenberg is designed to collect cores up to 

 almost 12 feet in length. It is widely used both 

 as a piston and gravity corer, and it can be low- 

 ered with the oceanographic winch using %2" 

 or %g-inch wire. 



The Kullenberg piston corer assembly con- 

 sists of the following components (figs. L-4 

 and 1^5) : 



Upper assembly or weight stand consisting 

 of main body tube, adapter, bail, and collar; 



