\fdO'^ - Old Forge Coal Mines

LAND SURVEYING. 263
is +8.86 chains, and the departure —5.44 chains. These
quantities we add with their
proper signs to those already
obtained, giving us the total
latitudes and departures from
Sta. 2, and we have for the
total latitude of Sta. 2 the sum
of — 8.86 and +8.86, which
is 0; and for the total departure,
the sum of + 5.44 and
— 5.44, which is 0. The lati-
tude and departure of Sta. 2
coming out equal to 0, proves
the work to be correct. (See
Art. 1332.) A plat of this
survey made from total latitudes
and departures from Sta. 2 is given in Fig. 71.
Through Sta. 2 draw a meridian N S. Lay off on this
meridian above Sta. 2 the total latitude at Sta. 3, viz., + 4.31
chains, a north latitude, and at its extremity erect a right
perpendicular to the meridian, and upon this perpendicular
scale off the total departure of Sta. 3, viz., +8.12 chains,
an east departure locating Sta. 3. A line joining Stations
2 and 3 will have the direction and length of the second
course. For Sta. 4 we have a total latitude of — 1.84
chains, a south latitude which we scale off on the meridian
below Sta. 2. The total departure of this station is + 12.58
chains, which we lay off on a right perpendicular to the
meridian, locating Sta. 4. A line joining Stations 3 and 4
of the third course.
gives the direction and length
Stations.
Total Latitudes
from Station 2.
0.00 ch.
+ 4.31 ch.
- 1.84 ch.
-8.80 ch.
0.00 ch.
Total
Fig. 71.
Departures
from Station 2.
0.00 ch.
+ 8.12 ch.
+ 12.58 ch.
+ 5.44 ch.
0.00 ch.