Page 761 records and reports 814 



The stamp is a multiple-purpose stamp to be used for leadline comparisons, fatho- 

 meter comparisons, or bar checks. The two inapplicable headings should be crossed 

 out each time the stamp is used. 



The readings of the apparatus 

 being tested should be entered in the 

 left-hand column; the lengths or depths 

 by the standard with which comparison 

 is being made should be entered in the 

 middle column; and the differences (first 

 column entries subtracted from middle 

 column entries) should be entered in the 



No. 35 BAR CIIKCI^ 



LEADLINE COMrARISON 



Mark or '. True length '. Correction 



Fatli. reading '. or depth ; 



M • D • D-M 



Le a d 1 1 ne fesiec/ correci- /"o 100 fi: 



Fir.uRE 178.— Facsimile of stamp for comparison of sounding ap- 

 right-hand column. (See 4622 for Veri- paratus with entries properly made. 



fication of leadlines and 557 for bar 



checks.) When the leadline is tested and found to be correct for all de])tlis for which 



it is to be or has been used, one entry stating this is sufficient, as in figure 178. (See 



also fig. 173.) 



814. Column Entries 



As may be seen by reference to figures 172, 173, and 174, the pages of the Sounding 

 Record are ruled into headed columns. It is important that each entry be made in the 

 correct column and that the entries be neat enough so that they do not encroach on 

 adjacent columns. Sloppy recording makes the subsequent interpretation of the rec- 

 ords more difficult and may i-esult in misinterpretation. 



All of the events and data which are related to a specific time entry shall appear on 

 the same horizontal line with the time, except for the position data where the first entry 

 only falls on that line (see 8146). Certain notations and miscellaneous entries in the 

 "Remarks" column may be referred to their respective times by the use of appropriate 

 corresponding reference marks at both. 



Where it is necessary during the day's work to enter data or long explanatory notes 

 which cannot be conveniently kept within the limits of the "Remarks" column, the 

 record should be interrupted, the entire width of the double page used for the entry, 

 and the record resumed below the entry. 



8141. Position Numbers 



Positions shall be numbered consecutively starting with number 1 at the beginning 

 of each day. These position numbers shall be entered, opposite their respective times, 

 in the column headed "Position Number." Each number shall be within the angle 

 symbol thus (<^^ ) ; the symbol should be made with care so that it cannot be mis- 

 taken for part of the number or for the letter I or L. 



Position numbers are to be given in accordance with 3312 and 6812. When using 

 R.A.R. control, each position in the Sounding Record on which there is a bomb 

 shall be identified by the addition of a lower-case b to the position number. In the event 

 that the bomb is a dud or that there are no usable results, the b shall be crossed out. 

 Position numbers in the Bomb Record shall be identical with those in the Sounding 

 Record (see 8311). 



No other entries shall appear in the "Position Number" column except the abbrevia- 

 tions ah. for ahead and st. for stop, which should be written close to the right-hand 

 edge of the column. 



465382—44 — —50 



