Page 845 miscellaneous 9233 



9233. Triangulation 



The triangulation record books and triangle closures shall be checked, and prelim- 

 inary lists of directions prepared and checked. A rough sketch of the scheme, com- 

 plete and to scale, shall be furnished, supplemented by clarifying notes where necessary. 

 Descriptions of stations and recovery notes shall be prepared, at least in pencil, making 

 certain that all distances and directions to reference marks are included. 



9234. Tide and Current Records 



Unless otherwise instructed, chiefs of field parties shall forward all tidal data and 

 records of current observations directly to the Washington Office. As tide reducers 

 will ordinarily be entered in the Sounding Records and checked by the field parties, no 

 tide records will be required by the Processing Office. 



9235. Miscellaneous Records 



A copy of the season's progress sketch, and the sheet layout if available, shall be 

 furnished to the Processmg Office. 



Miscellaneous data not having a direct relation to the hydrographic and topo- 

 graphic surveys, such as magnetic observations and the like, should be processed by the 

 field party and forwarded directly to the Washington Office. 



924. Completion Work by Processing Offices 



Field records will ordinarily be transferred to a Processing Office by chiefs of field 

 parties after all preliminary work has been completed. The Processing Office shall 

 continue the office work to the extent usually required of field parties before transmitting 

 the records to the Washington Office. In general, work to be performed by the Pro- 

 cessing Office will include the following steps. 



9241. Hydrographic Surveys 



(a) The reduction and checking of the soundings in the Sounding Records. 



(b) The construction and inking of smooth-sheet projections, and the plotting 

 and inking of the control stations. 



(c) Plotting the positions of the soundings — the three-point fix and R.A.R. positions. 



(d) Penciling the soundings. 



(e) Drawing the depth curves in pencil. 



(f) Lettering the geographic names in pencil. * 



(g) The preparation of the title sheet (Form 537). 



(h) The completion and writing of the Descriptive Report. 



9242. Topographic Surveys 



(a) Inking the projection, inshore details, vegetation, and other details not 

 already inked. 



(b) Lettering the geographic names in pencil. 



(c) The preparation of the title sheet (Form 537a). 



