70 Report of the Board of Shell Fish Commissioners. 
INSTRUMENTS. 
The instruments (sextants, protractors and drawing instru- — 
ments) and record books needed by the hydrographic — 
engineers for conducting the survey of the oyster grounds 
have been loaned to the Commission by the United States 
Coast and Geodetic Survey.t The uses to which the instru-— 
ments are put are described further on. 
Such instruments as have been found necessary for con-_ 
structing leasing charts, for computing areas and for con- | 
ducting the physical and biological investigations ? have been — 
purchased by the Commission. 
ORGANIZATION, 
The organization of the party for hydrographic field work ; 
when fully completed is as follows :* ; 
1 Hydrographic Engineer. 2 Oarsmen. 
2 Asst. Hydrographic Engineers. 1 Boatswain (houseboat). 
1 Draftsman. 1 Nightwatehman (houseboat), 
1 Clerk (on houseboat). 1 Coxswain (Investigator). 
1 Recorder. 1 Machinist (Investigator). 
1 Leadsman. 1 Tide Observer. 
1 Local Assistant. 2 Cooks. 
1 Expert Tongman. 2 Waiters. 
_Day laborers for buoy construction and oarsmen have been — 
hired as the exigencies of the work required. “a 
METHODS. 
The methods used by the Commission in making the hydro- — 
graphic survey of the oyster grounds of Maryland, with slight — 
modifications, are the same as those used by the United States _ 
1 Authorized by the Act of Congress approved May 26, 1906. 
? The apparatus used in ascertaining the density of the water over the oyster 
grounds is the property of the U. 8. Coast and Geodetie Survey. - . 
® Changes having been made in the personnel of the party as the survey pro- — 
gressed from one section of the State to another, the names of employees are 
omitted. = 
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