tlie bottom of the log sheet. In reporting the 

 directions of sea and swell, be sure to indicate 

 the direction from which the waves are coming. 

 Make the observations as soon as possible 

 while on station. Space is provided for re- 



marks; enter here whether waves are long- or 

 short-crested and note any reflecting waves, 

 confusion, or glassy surface of the sea. For 

 complete instructions see H. O. Pub. No. 

 606-e, Sea and Swell Observations. 



OCEANOGRAPHIC LOG SHEET M, PRNC-NHO-1365 



(New 8-52) 



BOTTOM SEDIMENT DATA 



14-219 GENERAL REMARKS.— The M- 



sheet is used to record all tj'pes of bottom sedi- 

 ment samples obtained during a cruise. This 

 sheet may be used for any type of bottom sam- 

 pling device. Indicate the type of instrument 

 used in the Remarks column. Instructions for 

 operating several tj'pes of bottom sampling 

 instruments are given in chapter 6. Study 

 those instructions carefully before using this 

 log sheet. 



14-220 THE LOG SHEETS.— A sample 

 log sheet is shown in figure 14-11. Print all 

 entries accuratelv and neatlv. 



14-221 The Log Sheet Headings.— Fill in 

 the ship's name and number, and cruise name 

 and number in the proper spaces. 



14-222 The Log Sheet Columns.— The log 

 sheet columns are completed in accordance 

 with the instructions given below. Use more 

 than one line per sample if necessary. If 

 there is not enough space for remarks, etc., 

 write them across the columns using one or 

 more lines. 



14-223 Serial No. — Record the designated 

 serial number for each sample as taken. 



14-224 Date. — Record the day and month. 

 Record the hour and minute the sample is 

 obtained on the same line above the date. 

 Use Greenwich mean time to determine the 

 time and date. 



14-225 Sample Position. — Record the cor- 

 rected ship's position for the time the sample is 

 obtained. Latitude and longitude are recorded 

 in degrees and minutes unless greater accuracy 

 is required for special area surveys. Indicate 

 whether N or S latitude and E or W longitude. 



1-4-226 Depth.— Record the depth in fath- 

 oms at the time the sample is obtained. 



14-227 Weight of Sampler.— Indicate the 

 weight of the sampler used in pounds. 



14-228 Approximate Penetration. — This 

 column is used when samples are obtained with 



coring devices. Penetration of the corer is 

 measured in feet and inches. As soon as the 

 corer is secured on deck, measure the amount 

 of sediment retained on the outside of the cor- 

 ing tube from the end of the cutting edge to 

 the top of the visible sediment. 



14-229 Length of Tube.— This column is 

 used when samples are obtained with coring 

 devices. For corers with plastic liners the 

 length of the tube is the length of the liner 

 plus the cutting edge. For Ewing piston corers, 

 it is the length measured from cutting edge to 

 top of core tube. Record the length in feet 

 and inches. 



14-230 Length of Core.— Measure the 

 length of the core obtained from the cutting 

 edge to the top of the sediment. Record the 

 length in feet and inches. 



14-231 Field Description.- Enter a field 

 description of the sample when required. De- 

 scription of materials, stratification, coarseness, 

 and colors are desired. When color is given, 

 it should be obtained from comparison with 

 the Rock-Color Chart of the Geological Society 

 of America. 



14-232 Remarks. — Enter in the Remarks 

 column any pertinent information necessary 

 for future identification of the sample. Give 

 the station number; type of instrument used; 

 length of free fall; condition of cutting edge; 

 date extruded; type of container used for dis- 

 position of sample from cutting edge and core 

 catcher, scoopfish, snapper, dredge, etc. When- 

 ever a core is extruded, record the date of ex- 

 trusion and give the number of the box in which 

 the core is stored. 



14-233 Observer's Initials.— The initials of 

 the person concerned with obtaining and pre- 

 paring the sample should be entered in this 

 column. 



H. O. 607 



155 



