Page 749 the smooth sheet 7914 



7914. Use of Leaders 



Explanatory notes are occasionally used on the smooth sheet to avoid possible 

 misinterpretation of the data (see 781). In order that these may be placed where they 

 will least interfere with the liydrographic data it is often necessary to use a fine leader, 

 or arrow, leading from the note toward the feature to which it refers. Such leaders or 

 arrows are frequently of advantage to emphasize the least depths on shoals (see 7753). 



7915. Removal of Temporary Notes 



All temporary pencil notations made on the smooth sheet during the plotting, 

 should be removed before the sheet is transmitted to the Washington Office. 



7916. Initials of Plotter and Verifier 



During the construction and plotting of a smooth sheet various specific steps are 

 performed. The records must show clearly responsibility for each step, whether it is 

 of plotting or verification. Rubber stamps are provided for this purpose. Stamp No. 

 42, Hydrographic Survey, is placed in the lower right-hand corner of the smooth 

 sheet and the initials of the plotter and verifier of the phases of work indicated thereon 

 must be appropriately entered (see 746). Rubber Stamp No. 88, Processing, (fig. 183) is 

 entered in the Sounding Records at the end of each day's hydrography, and the plotter 

 must enter his initials in the appropriate spaces using a pencil of the same color he 

 used to checkmark items in the Sounding Records during the protracting and plotting 

 of the data (see 76 and 773). 



792. Schedule of Penciled and Inked Details 



For the guidance of the smooth-sheet plotter, table 28 lists the various details 

 that are to be shown in pencil and in ink on the smooth sheet when it is forwarded 

 to the Washington Ofiice. It is to be noted particularly that practically all the 

 topographic information offshore from the high-water line is to be shown in black 

 ink if it originates with the topographic survey and has been verified by the hydrog- 

 rapher, but like information originating with the hydrographic survey is to be left in 

 pencil. 



793. Registry Numbers and Titles 



At the beginning of each field season each survey sheet is assigned a temporary field 

 number by the Chief of Party (see 1541 and 3213). These field numbers are used for 

 reference purposes during the early part of the season, but are subsequently replaced by 

 permanent registry numbers assigned by the Washington Office. The registry number 

 should be available on completion of the smooth sheet, and if so, this number should be 

 shown in pencil on the back of the sheet in the middle of each end, with the corresponding 

 field number just above it. The registry number should be used in referring to the 

 smooth sheet or to any of the records pertaining thereto, after it is available. (See 1542 

 and 1543.) 



After the smooth sheet is received in the Washington Office and registered, it 

 becomes a part of the permanent archives, and thereafter is never taken from the 

 Washington Office. 



