U.S.GEOGRAPHICAL SURVEYS 
WEST of the JOO'R' MERIDIAN 
Conventional Signs 
FOR 
Triangulation, Outline and Topographical Plots of Atlas Sheets. 
Astronomical Stations. 
(D A 
Primary. Uswdly at a city. town., etc, 
Secondary. Longitude by telegraph,. 
Sextant tor Latitude 
Sextant Latitude checks. 
Triangrilation Stations. 
6. 
50 _ 
® To- 
Q 
50 - 
A 
S &ZZBANDED PEAK 
&_ARGUS PEAK 
&ZZN.E.BASE 
'fe £ ~MT. HAHN - 
£,77^ INOIAN WELLS 
Primary. 
Secondary. 
Base,and. Base Develop? rmnt,. 
Cross Sigh t.. 
Three Point. 
C amp s and Me ander Line s. 
— JO.P.3. JUL. 3. 73. . 
CamplO, Party ,3, July 5't 1873 
Camp 
Note . In case a camp is nt art JlstronomicaZ or Triangulation 
Station. 7 the following is used, e.g. 
\/1e< 1JL< ^ r _ 
, v l.Lt-WheetRYU 
JI.P.J. SEP. 7. 73. 
to.p.J. SEP. a. j3. Note. In some portion oILine write in the designation o£ the party, 
name of OLRcer, orJ/ssistarvt in charge, month andyeari arid 
an —d showing direction of travel . .tin ,/lstronomicaL or 
Trian.galaMon, Sta.may be occupied also as a Meander Sta. 
Distances. 
21.6 ms. 
To he written, above the .Meander Line 
between, prominent points, the arrows 
showing from, oral to what points. 
Triangulation 
Lines joining primary stations. 
,, secondary „ 
„ from three point ,, 
,, to cross sight „ 
Topography. 
to ooj; 
Scale linoh to 2 miles. 
Altitude s ref err e d to s e a level 
116’. 5 A 
14436'. 9 & 
512.6 * 
( 0328 '. 5 ) £ 
By Connected level lines. 
JBy Cistern. Barometer-. 
By . Ineridi l Barometer. 
/'rant Jingles ofBlevati.on or Depression.. 
Note. Write the difference of 
.Altitude apop.aline red line 
joining the. stations, taking the 
mean,with or without weight, as 
decidedupon, for the. altitude. 
Connected Bevel,lines to be 
825.6 shown by a dotted red line. 
Ma gnetic Variation . 
Direction indie ated by inclined line : .//mount by 
degrees etc , written along line e.g. 20° 01 10". 
L ettering 
STATES 
COUNTIES 
CAPITALS 
“JL 
-50 
COUNTY TOWNS 
Settlements — 5 
RIVERS 
“JL 
—50 
CITIES 
Villages I 
5 
50 
5 
50 
-Ao Military' Forts and. Camps_ 
P. O.Posi Office 
JL 
50 
Creek SY 
8 
. 50 
MOUNTAIN RANGES 
35 
ioo 
For/MountatnPeaks ete.use same character ofletter as far Triangulation Stations. 
Roads, frails,railroads, telegraph lines etc, as represented on J/tlars Sheets. 
Drainage Divide 
EXPEDITIONS— Under Eke Command, of 
IstLieutGeoAIWheeler,Corpsof Engineers,US. Antiy: 
BY ORDER OB THE HONORABLE THE SECRETARY OF WAR. TINDER THE DIRECTION OF BRIG. GEN. A.A.HUMPHRE YS, CHIEF OF ENGINEERS,U.S.ARMY. 
