76 NAUTICAL CHART MANUAL 



IX 



Registration of Surveys 



The registration of hydrographic surveys (H-Series) is completed upon receipt of the 

 Smooth Sheet, Descriptive Report and field records in the Washington Office. Besides the 

 regular basic hydrographic surveys there are wire-drag surveys (which are filed as the H-Series 

 with a suffix W.D.), field examinations (which are designated as F.E. and filed progressively by 

 the year of the registration), and the deep-sea tracklines (which are filed under specific H-Series: 

 H-7100 to 7119). AU permanent survey records such as supplementary special reports, 

 sounding volumes, fathograms and other such records are forwarded to the Bureau library. 



The registration of photogrammetric surveys (T-Series) is not completed until after the 

 survey has been reviewed and approved. Although copies of many photogrammetric compila- 

 tions can be obtained from the vault they may represent only the incomplete, preliminary or 

 advance photogrammetric information. These copies are maintained as a temporary reference 

 file and are destroyed upon receipt of the final approved copy. 



The various types of photogrammetric surveys filed in the vault are Planimetric, Shore- 

 line and Topographic surveys. Planetable surveys generally made prior to the advent of 

 photogrammetric surveys are also filed in the vault. These may also be planimetric, shoreline 

 or topographic in the details shown. The registry numbering of the planetable surveys are 

 from to 4999, those mounted on aluminum are from 6000 to 7999; photogrammetric surveys 

 are numbered from 5000 to 5999 and 8000 to 12000. 



Geographical indices are maintained for all registered surveys on medium-scale nautical 

 charts of the Bureau. The actual coverage is diagrammed on these charts, some of which are 

 programmed on two or more copies to avoid congestion. 



Survey Repository 



The original surveys of the Coast and Geodetic Survey are filed in the fire-proof repository, 

 located in room 1117. This vault contains over 9700 topographic and 8700 hydrographic 

 surveys which have been made since 1834. 



The vault is also a storage depot for assorted docimients associated with the Bureau 

 surveying activities and for some classified materials. It is needless to say that this material 

 is irreplaceable and should be handled with extreme care. 



All persons removing documents or surveys from the vault shall complete either the blue 

 (hydrographic) or the pink (topographic) request forms C&GS-8255, "Topographic/Hydro- 

 graphic Sheet Request" and assume complete responsibihty for the prompt return of aU items 

 borrowed. 



