\fdO'^ - Old Forge Coal Mines

264
LAND SURVEYING.
The total latitude of Sta. 1 is — 8.86 chains, a south latitude,
which we scale off on the meridian below Sta. 2. The
total departure of Sta. 1 is + 5.44 chains, an east departure,
which we scale off on a right perpendicular to the meridian,
locating Sta. 1. A line joining Stations 4 and 1 will have
the direction and length of the fourth course. The total
latitude and departure of Sta. 2 being 0, a line joining Sta.
1 with Sta. 2 will have the direction and length of the first
course, and the resulting figure 2, 3, 4, 1 is the required
plat of the survey.
(739)
(740)
See Art. 1334.
See Art. 1335.
(741) See Art. 1336 and Fig. 323..
(742)
See Art. 1336.
(743) The signs of the latitude always determine the
character of the products, north or + latitudes giving north
products and south or — latitudes
See Examples 746 and 747.
giving south products.
(744) See Art. 1338.
(745) Rule twelve columns with headings
as shown in
the following diagram, cal'culate the latitudes and departures,
placing them in proper order. Balance them, writing the
corrected latitudes directly above the original latitudes,
which are crossed out. Calculate the double longitudes from
Sta. 2 by rule given in Art. 1335, and place them with
their corresponding stations as shown in columns 11 and 12.
Place the double longitudes in regular order in column 8.
Multiply the double longitude of each course by the corrected
latitude of that course, placing the products in column
9 or 10, according as the products are north or south.
Add the columns of double areas, subtracting the less from
the greater and divide the remainder by 2. In this example
the area is given in square chains, which we reduce to acres,
roods, and poles as follows: Divide the sq. chains by 10,
reducing to acres. Multiply the decimal part successively by
4 and -40, reducing to roods and poles.