Survey of Oyster Bars, Somerset County, Md. 27 



tions." This has been made possible by the careful measurements of direction and 

 distance of these stations from the "observed station," which are recorded under the 

 heading of "References." 



Under the heading of "References" are given the directions and distances of all 

 objects that might be useful in locating the stations when the surface marks can not be 

 found. It is also contemplated that for general purposes of topograph)-, hydrography, 

 or location of boundaries of oyster bars these references will be sufficient in many cases 

 to relocate the position of an "observed station" or reference station when both of 

 them have been destroyed. 



The first reference object given in the descriptions is always a triangulation station 

 visible from the station being described. Its direction is taken as being o° 00' 00", 

 and the direction of all other objects arc measured from it as an initial point, the angles 

 being taken in a clockwise direction (left to right). 



The true bearing " of the initial object is always given in parenthesis alongside the 

 name. This furnishes means for the calculation of the bearings of any of the other 

 reference objects for the purposes of locating a station by compass bearings or for the 

 relocation of corner buoys of oyster bar boundaries by the method of horizontal angles 

 described in this publication under the heading of "Boundaries of oyster bars." 



The distances in the last column under "References" are given in three different 

 units, which vary according to their accuracy. The "miles" are statute miles and may 

 be considered only as rough estimates. The "yards" are more accurate, but must be 

 looked on as results generally obtained by pacing or careful estimating. The "meters," 

 however, are accurate to the degree indicated by their decimals and in every case have 

 been measured with a steel tape. In the same manner the accuracy of the directions 

 are indicated by the refinement of direction with which they are recorded. 



DESCRIPTIONS OF TRIANGULATION STATIONS. 

 SENATOR. 



Locality. — Western shore of Tangier Sound, on southern side of Holland .Straits and on extreme 

 northeast point of South Marsh. (See Charts Nos. 5, 6, and 7.) 



Observed station is on marsh land about 35 yards from north side and about 30 yards from east 

 side of point. Myrtle bushes skirt shore, commencing due north, and two small pools of water are 

 near station, one due south about 10 yards and the other southwest about ,5 vards. No permanent 

 reference points near station. 



Marks. — Observed station is center point of triangle on standard cement monument. 

 References. — ° ' " 



" Sharkfin Shoal Light" (N 16° 20' E) 00 00 00 4^ miles. 



Chimney on house to right of "Haines" 31 30 __ 4^ miles. 



L eft-hand chimney of crab house on Deal 



Island 50 19 ._ 3K miles. • 



Right end of large oyster house on Deal 



Island 81 5Q .. 3^2 miles. 



• Lone pine tree 301 35 ._ ij 8 miles. 



" The mean magnetic variation for Somerset County for 1908 was 5 30' west of north and increas- 

 ing at the rate of 3' yearly. 



