Page 791 records and reports 8431 



Beginning with the first page of the text, it and the attached inserts shall be 

 numbered consecutively, ending with the approval sheet (8437) which is always placed 

 last. 



8431. Statistics 



An abstract of statistics of field work shall be made for each hydrographic survey 

 and attached to the Descriptive Report. The sheet should be headed "Statistics for 



Hydrographic Survey H- " {inseii here registry number of sheet and year 



of survey in parentheses), iollowedhy the name of the vessel and the project num- 

 ber. The statistics should be arranged by days, giving for each day, the volume num- 

 ber or numbers, the day letter, the date, the number of handlead and wire soundings, 

 the number of positions, and the number of statute miles of sounding. Totals for the 

 survey should be given, including the total number of square statute miles of sounding. 

 All statistics should be given in standard units (see 124) , 



Where two or more vessels are used on one hydrographic survey, the statistics 

 for each should be shown separately. 



8432. Tide Note 



A tide note, on a separate sheet of paper, shall be furnished for each survey and 

 included in the Descriptive Report. The location, including the latitude and longi- 

 tude, of each tide station used for reducing the soundings plotted on the sheet shall 

 be given. If more than one station was used, the tide note should define the limits 

 of the area in which each was used. This note should also state the height of the 

 tide staff at each station corresponding to the plane of reference and whether any 

 corrections for differences in time or height were applied to the observed tides. If 

 the hourly heights were furnished from the Washington Office the tide note should so 

 state. Should the same tide note be applicable to more than one survey, a copy of 

 the original note shall be included in the Descriptive Report of each. 



8433. Geographic Name List 



An alphabetic list of all the geographic names penciled on the smooth sheet 

 shall be prepared separately and inserted in the Descriptive Report (see 165). The 

 list may be arranged in two columns, if there are many names, provided there is a blank 

 space of 1 ji inches to the right of each column for Office entries (see 9321) . No other 

 information should be included with this list, except references to any ispecial reports on 

 the subject and to the pages of text of the Descriptive Report, where geographic names 

 are discussed. (See also section 16.) 



8434. Velocity Correction Abstract 



An abstract, in tabular form, of the velocity corrections which were applied to 

 the echo soundings shall be included as a separate entry, for each survey where echo 

 soundings are used. These corrections will generally be derived from the correction 

 ciu-ves which are submitted with the special report on the velocity of sound (see 833) . 

 If a special report is not submitted, a detailed explanation of the derivation of the cor- 

 rections shall be furnished under one of the UtoY headings in the Descriptive Report. 

 (See also 561.) 



If different corrections were applied through different time periods, the abstracts 

 shall indicate clearly to which periods each abstract of corrections is applicable. If 



