6-21 The Core Label. — A core label, shown 

 in figure 6-6, is attached to the core sample. 

 The label lists all pertinent information relating 

 to the core and is to be filled out immediately- 

 after obtaining the core. A feature of the label 

 is that when it is properly attached the top of 

 the core is indicated by the word "top" and two 

 flanking arrows. Proper identification will pre- 

 vent loss of cores, effort, and time. Tape the 

 label securely to the liner and make sure that 

 the sample jar is properly marked with the 

 same identifying serial number as the core. 



t TOPt 



Score sample D bottom sample 



swPLE NO -PhjUE&Bf?. Co^£ rJo. J 7 

 SHIP ^j-j 7^ E H-oS Q-TH- (f\Cr$-s-a^ 



GENERAL LOCATION STh-TlQAl l^E-ZS'-S^ 



^3" 30'A/ 



X?" 39' iV 



DEPTH (f.,) /2.yO '"> 23'// 



-^;g<g^g^.?X,.,,->^ 



Figure 6-6. Sample core labeL 



6-22 Securing the Corer. — All parts of the 

 Phleger corer must be washed after each lower- 

 ing. This cannot be>tOo strongly emphasized. 

 The cutting edge, core catcher, coring tube, and 

 mainweight must be well rinsed to remove all 

 evidence of bottom material from a previous 

 coring operation. After all coring activities are 

 completed, the corer is prepared for packing. 

 This involves washing down the corer to remove 

 all sediment. After drying, a hght coat of 

 machine oil is applied to all parts. A wooden 

 shipping case is furnished as part of the core 

 assembly and accommodates the corer, release 

 mechanism, trigger line, trigger weight, and 

 free fall chain. Smaller parts, such as core 

 catchers and cutting edges, are also stored in the 



H. O. 607 



6-23 Maintenance of the Phleger Corer. — 



In general, the corer requires very little mainte- 

 nance. However, the cutting edge may be 

 dented should the corer hit hard or rocky bot- 

 tom. If not badly deformed the cutting edge 

 may be hammered and filed back into shape 

 and used again. Core-catcher springs must 

 be watched for free play of action. Inasmuch 

 as the spring leaves are delicate, care should 

 be taken in the handling and packing of core 

 catchers. Needless to say, any damage to this 

 important unit of the corer will result in un- 

 warranted loss of samples. Most corers used 

 by the Hydrographic Ofiice are made of stain- 

 less steel. However, some corers are made of 

 ordinary steel and must be wire brushed and 

 painted periodically to minimize corrosion 

 effects. The interior must be wire brushed and 

 coated \vith a thin film of oil to prevent the 

 pitting and rusting which obstructs entrance 

 of the plastic liners. 



6-24 Packing, Storing, and Shipping of 

 Phleger Cores. — To prevent disturbance and 

 damage of the core, the sealed liner should be 

 stored in an upright position. For this pur- 

 pose a special shipping case should be provided. 

 This case should be wooden, compartmented 

 to hold a number of cores in an upright posi- 

 tion, and provided with a screw-fastened top. 

 The case must be plainly marked HANDLE 

 WITH CARE and THIS END UP and is to 

 be packed, stored, and shipped in an upright 

 position at all times. It should be marked 

 with the ship's name and number and the 

 cruise name and number. Cases to be shipped 

 to the Hydrographic Office are to be addressed 

 as follows: 



The Hydrographer 



U. S. Navy Hydrographic Office 



Washington 25, D. C. 



Attn: Code 5430 

 6-25 PRINCIPLE OF OPERATION OF 

 PISTON CORERS,— Interest in obtaining un- 

 disturbed cores has resulted in a number of 

 developments directed toward improving ocean 

 bottom coring samplers. Most notable and 

 successful has been the piston corer, of which 

 the Kullenberg and Ewing corers are repre- 

 sentative. Inasmuch as the principle of opera- 

 tion is identical for both types the following 

 paragraph applies to both. However, detailed 

 descriptions for each instrument will be treated 

 separately. 



6-26 The Piston. — A closely fittmg piston 

 attached to the end of the lowering cable is 

 instaUed inside the coring tube just above the 



57 



