56 Survey of Oyster Bars, Somerset County, Md. 



corner of the boundaries of one or more other oyster bars, crab bottoms, or clam beds, 

 only the number of the corner of the oyster bar being described in the table is given 

 in this column. 



The second and third columns, under the headings of "Latitude" and "Longitude," 

 give the geographic positions of the corners. These positions have been adopted by the 

 Commission as the primary technical definition of the corners, and should be considered 

 as final in case of a dispute arising from discrepancies caused by other means of location. 

 The latitudes and longitudes given in these columns are based on the United States 

 standard datum of the Coast and Geodetic Survey, and the points thus defined can be 

 relocated from distant triangulation stations of the Survey, even though all the land- 

 marks and buoys originally used for their location have been destroyed by natural causes 

 or by acts of vandals desiring to defeat the purposes of the oyster laws of Maryland. 



The fourth and fifth columns, under the general heading of "True bearing" and 

 the specific headings "Forward" and "Back," give bearings measured from a true north- 

 and-south line. The three "Forward" bearings are from the corner of the boundary 

 designated in the first column to the triangulation stations named on the corresponding 

 lines in the last column, and the three "Back" bearings are from these same stations in 

 the last column to the corresponding corner of boundary in the first column. The 

 difference in minutes of arc between the forward and back bearings shown in some cases 

 is actual and not accidental, and is due to the fact that the computations took into 

 account the spheroidal shape of the earth. 



The sixth column, under the heading of "Distance," gives the three computed 

 distances in yards from the corner of the bar noted in the first column to the three 

 triangulation stations named on the corresponding lines in the last column, and vice versa. 



The seventh and last column, under the heading of "U. S. C. & G. S. triangulation 

 station," 6 gives the names of the landmarks from which were computed the correspond- 

 ing "Latitude," "Longitude," "True bearing," and "Distance" of the. "Corner of the 

 bar" designated in the first column. A full description of the location and markings 

 of these triangulation stations is given in another part of this publication, under the 

 heading of "Description of triangulation stations." 



SURVEYING METHODS FOR RELOCATION OF BOUNDARIES. 



There are a number of methods that can be used in the relocation of the actual 

 boundaries of the natural oyster bars as technically described in this publication and 

 delineated on the published charts of the Coast and Geodetic Survey and the leasing 

 charts of the Shell Fish Commission. 



The following brief descriptions of five of these more or less different methods 

 assume a certain amount of experience and knowledge on the part of the engineer in 

 the particular kind of surveying under consideration, and are only intended as reminders 

 of ways and means that can be used. 



There are two problems that are likely to present themselves to those interested in 

 the boundaries of natural oyster bars. One, to determine whether the buoys marking 



« The mean magnetic variation of Somerset County for 1908 was 5 30' west of north, and increasing 

 at the rate of 3' yearly. 



6 Geographic positions of these triangulation stations can be obtained by application to the Super- 

 intendent of the Coast and Geodetic Survey at Washington. 



