104 Report of the Boar -d of Shell Fish Commissioners 



HYDROGRAPHY. 29 



i 



INFORMATION FURNISHED. 



Before beginning the actual survey of the oyster grounds the 

 Commission was furnished by the United States Coast and Geo- 

 detic Survey with projections, constructed on a scale of 1 part 

 in 5,000 (approximately 6 1-3 inches to a statute mile), show- 

 ing the coast line of the localities to be surveyed and the 

 plotted positions of the triangulation stations. The Coast and 

 Geodetic Survey also placed a party in the field to erect such 

 triangulation stations as were needed by the hydrographic engi- 

 neers for use in making the survey of the oyster grounds. 30 



Under this heading, mention may be made of the service 

 rendered by the United States Bureau of Fisheries, an assist- 

 ant from that Bureau, Dr. H. P. Moore, having been detailed 

 to consult with the Commission and the hydrographic engineer 

 concerning the methods to be adopted and used for surveying 

 and examining the oyster grounds. 



Prior to making a survey of any section the local assistant; 

 appointed by the County Commissioners, informed the hydro- 

 graphic engineer of the approximate location and extent of the 

 oyster grounds of the section so they could be indicated in 

 pencil on the boat sheets. This information greatly expedited 

 survey operations in that it made surveys of barren bottoms 

 unnecessary. 



EQUIPMENT. 



The equipment for conducting the snrvey of the oyster 

 grounds and crabbing bottoms consists in boats and instru- 

 ments. 



2The chapters on HYDROGRAPHY and STATE BUOYS have been ab- 

 stracted from the report of the Chief Engineer to the Commission. 



soprevious to the time the field work of the Coast and Geodetic Survey 

 party began, October 10th, 1906, a number of signals were erected over 

 the old Coast and Geodetic Survey triangulation stations by the hydro- 

 graphic engineers x>f the Commission and at other times also it has 

 been necessary for the Commission to assist with this work. 



