authorized to change the name, it seldom does. Ensure that a suitable name is selected, preferably a
short one matching a geographical feature or political subdivision at or near the station. Never use
duplicate names within the same triangulation system. In many incidences, the name of the landowner
is given to the station. This normally stimulates interest on the part of the owner, helps to avoid
duplication, and serves to locate the station quickly. Avoid using the names of men in the party,
nicknames, names without meaning, or names arising from the incident. Ensure the correct spelling of
the name.
PART M - SIGNALS AND TOWERS
2-57. Marking. Mark each triangulation station in some manner so that, as the survey progresses, an
accurate triangulation net will be obtained. Signals must be visible from nearby stations.
a. If a station is one in which observations are taken, but is not occupied for the measurement of
angles, it is not necessary to make provisions for setting the instrument. In this case, use a simple and
inexpensive signal structure, such as the following:
An object already in place, such as a flagpole, a chimney, or a telegraph pole.
A pole set vertically in the ground or held firmly in a vertical position by a pile of stones, guy
wires, or bracing (an excellent signal on a bare summit or in open country).
b. When taking angular observations at an instrument station, construct a signal with the instrument
which has been placed directly over the station.
c. If a station will be used for any length of time, drive a pipe into the ground to mark the location.
If the point is being used for a sight, a range pole or similar rod may be placed in the pipe. When the
station is being occupied, the pole should be removed.
d. When a tall mast is necessary for visibility, use guy wires to anchor the sight. Provisions should
be made for swinging the bottom of the mast to one side when placing an instrument at the station.
2-58. Signal Lamp. The most commonly used signal lamp has a 5-inch reflector. When used for
sightings of less than 8 kilometers, the face of the light must be masked to reduce its size and brilliance.
a. Reflector. The reflector is frailly constructed and must be handled carefully to prevent tarnishing
and scratching. It should be polished with a soft chamois skin or tissue, using only cleaning
preparations recommended for this purpose. For a
EN0593
2-38
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