186 
PRIMARY TRI ANGULATION AND PRIMARY TRAVKRSK. 
SANDY, SAN PIE(iO COUNTY. 
On the highest point near the southeast end of long- range of sand 
hills, about 1.5 miles northeast from monument 210 on United States 
and Mexico boundary. 
Signal: A lumber tripod. 
Station mark: A 2 by 3 inch stake set in sand under center of tri- 
pod. No bench mark available at time this station was occupied, and 
it is impossible to preserve center accurately, as the hill is constantly i 
moving. 
[Latitude 32° 43' 11.53". Longitude 114° 53' 19.99".] 
To station- 
Azimuth. 
Back azimuth. 
Log. distance 
O / II 
O / ft 
Meters. 
Gravel 
81 57 26. 19 
' 261 49 37.80 
4. 35805 J 
Blizzard 
146 36 52.18 
326 34 08. 21 
4. 15588J 
American 
219 54 43.91 
39 59 10. 25 
4. 29952(1 
Pilot Knob 
264 01 50.97 
84 06 28. 27 
4. L280lJ 
SHARP, s\X DIEGO COUNTY. 
On tl 10 highest point of low sand hills about 8 miles east from Calex- 
ico and about one-fourth mile north of the United States and Mexico 
boundary. 
Signal: A lumber tripod 12 feet high. 
Station mark: A standard bench-mark post set 40 inches in the sand 
under center of signal. (This hill is constantly drifting and mark may 
be covered or blown out of the ground at any time.) 
[Latitude 32° 40' 38.67". Longitude 115° 23' 14.39".] 
To station— 
Azimuth. 
Back azimuth. 
Log. distance. 
Holtville 
o / // 
180 49 09.89 
226 44 40. 06 
257 35 35.29 
o / // 
49 13.95 
46 49 36. 34 
77 39 16.65 
Meters. 
4. 134767? 
Hog 
4.2916431 
Mesquite 
4. 038689*1 
SIGNAL MOUNTAIN 
LOWER CALIFORN 
I A, MEXICO. 
On the more eastern of the two highest points on Signal Mountain, 
a well-known mountain about 12 miles from Calexico. It is on tbl 
Mexican side of the boundary about 1£ miles below the line. Monu 
ment No. 224 is at the foot of mountain. 
Station mark: A rock cairn 6 feet at base and 9 feet high. (Then 
is a cairn about 4 feet high on the southwest summit.) 
