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HYDROGRAPHIC MANUAL 



Page 754 



If more than one hydrographic survey unit surveys in an area covered by a single 

 sheet, a temporary series of numbers shall be used by each imit that uses more than one 

 volume; except that a small amount of sounding, such as the development of a shoal 



Figure 172.— Record of handlead and wire soundings— sextant fixes. (Double page of Sounding Record reduced about one-half.) 



by a launch in an area surveyed b}^ a ship, may be recorded in a ship volume, if more 

 convenient. 



The record must be unmistakably legible. Fine lettering is not required, neither 

 is it necessary to print in making entries, but it is essential that every numeral, abbrevia- 



