Page 779 records and reports 8313 



8313. Astronomic Sights 



Where sounding lines have been controlled by astronomic sights, recorded obser- 

 vations and computations on Form 719, Astronomic Sight for Hydrographic Control, 

 and the sheets on which the lines of position were plotted, and Form 722, R.A.R. and 

 Dead Reckoning Abstract, shall be assembled in chronological order and bound in a 

 folder and forwarded to the Washington Office. The computations and the plotting 

 sheets for any one hydrographic position should be assembled together. 



Smooth copies need not be made of any of the computations or data — the originals, 

 if legible, will suffice. 



The use of Form 719 for the computation of astronomic sights is explained in 3382 

 and the plotting of morning and evening star sights on separate sheets is described in 

 3387. 



No written report need accompany these records unless the observations have been 

 used for unusual purposes, or methods not described in this Manual were used in 

 adjusting the sounding lines to the lines of position. 



832. Control Records 



In addition to the control stations located by triangulation and topography, sup- 

 plemental stations must often be located by hydrographic methods for use during the 

 hydrographic survey. This is particularly true of oft'shore surveys, where buo}^ station^ 

 are always located by the hydrographer. The observations taken to locate such stations 

 must be recorded permanently and the record, together with the associated computa- 

 tions, must be transmitted to the Washington Office with the smooth sheet. These 

 are the sole records of the data used in determining the positions of the buoy stations, 

 and they form a part of the permanent records of the survey. 



The location of buoy stations requires a lai-ge amount of varied observation data 

 and computations. Such control records may be conveniently grouped as follows: 



(a) Buoy stations located by direct reference to shore control and the necessary computations 

 (see 8322). 



(b) 01:)servations and computations of buoy traverses (see 8323). 



(c) Buoy stations located by R.A.R. distances (see 8324). 



A buoy-controlled hydrographic survey may require only the control records listed 

 in (a), or records listed in (a), (6), and (c) may be required, depending on the method of 

 establishing the control and the type of survey. In any case the records and compu- 

 tations should be separated into these three categories for transmittal to the Washing- 

 ton Office. A notice "Not for Geodesy" should be included in each package of such 

 records, so that they will not be sent to the Division of Geodesy when received at the 

 Oflice. 



Typed copies of these control records and computations are not necessary; the 

 original copies in pencil, if legible, will suffice. All of the computations must be on 

 letter-size paper or be folded to that size for facility of storage in the archives. Only 

 the accompanying report, when required, and the list of buoy station locations in the 

 Descriptive Report (8435) need be typed. 



8321. Station Locations by Sextant 



Sextant observations to locate a few supplemental stations may be recorded 

 in the Sounding Record with the hydrography (see 248 and 8146), but whenever a 

 considerable number of stations are so located by the hydrogi'aphic party the obser- 



