172 



HYDROGRAPHIC MANUAL 



.O.^. 



^' S/ou) 



No 36 



Sextanto fc^'O. Clock 



Sounding records inspected : 



_ JU^^j _ ^C?St.tpi. _ Officer-in-charge 



/^%>*6_7L Chief of Party 



Figure 68. — Facsimile of hydrographic stamp No. 36. 



of the sextants and clock used is required 

 at the end of the day using Stamp No. S6 

 (Fig. 68). This stamp also includes spaces 

 for the signature of the officer-in-charge 

 and the chief of party. 



The statistics for each day's work shall 

 be given at the end of each day's work, using 

 rubber Stamp No. 37 (Fig. 69). Where a 

 day's work is recorded in two volumes, the 

 statistics shall be divided between the two 

 volumes, the stamp being used at the end of 

 the first volume as well as at the end of the 

 day in the second volume. The stamp provides 

 for this division and a total for the day. Echo 

 soundings are not to be counted — note that 

 the stamp specifically indicates that only 

 handlead and wire soundings are to be 

 counted. 



All distances shall be entered in nautical 

 miles; conversion to statute miles on line 

 three of the stamp may be omitted. 



Rubber Stamp No. 38, Processing (Fig. 

 70) is required in connection with the re- 

 duction of the records. Unless this stamp is 

 impressed as each day's work is completed, 

 space must be left for it. The location of 

 the tide gage used during the day shall be 

 entered in this stamp in the space provided. 



5-99 Completion of sounding records. — 



Reduction of soundings procedures are dis- 

 cussed in subsequent sections of this chapter ; 



No 37 STATISTICS...;? DAY 



This vol Total: 



No sdgs. (Hi. and wire) ^. .^<?._ 



No. Positions ..J:^. I7.i>. 



Miles sdg. line... 7!.Z..^..._Naut. Stat. 



Dist. to and froni..t3'.t.'Z... Naut. Mi. 



Misc. dist. run A.^... Naut. Ml. i$2..7-._Naut 



Sounding continued in votume 



Figure 69. — Stamp used to record hydrographic sta- 

 stistics in sounding record. 



Figure 70. — Processing stamp with entries properly 

 made. 



and smooth sheet plotting procedures are 

 described in Chapter 6. Work on the records 

 required by this section may be done at any 

 time after the survey is completed, but must 

 be accomplished before the smooth sheet 

 and records are forwarded to the Washing- 

 ton Office. If the smooth sheet is to be 

 plotted at a processing office, the records 

 shall be completed before they are trans- 

 mitted to that office. 



After the survey is completed, all the 

 sounding records for that survey shall be 

 gathered together and the following steps 

 accomplished : 



(a) The records shall be grouped in the 

 proper order, the various groups combined, 

 and the complete set numbered consecutively 

 and permanently, including any volumes 

 used solely for cuts or other miscellaneous 

 data (see 1-32). 



(b) The data called for on the cover label 

 shall be entered in black drawing ink, except 

 the position numbers and day letters, which 

 shall be entered with ink of the color used 

 in the record. Two entries are required for 

 the hydrographic sheet number: the field 

 number and the registry number. Rubber 

 stamps, when available, may be used for 

 some of the entries. 



(c) On ships which use a magnetic steer- 

 ing compass, the deviation table for the 

 compass shall be entered on page 1 of the 

 first volume of each set of records, and in 

 the proper record with reference to date if 

 changed during the survey. Deviation ta- 

 bles are not required for launches or other 

 small boats using portable compasses (see 

 2-28). 



