Three Invar tapes (standardized).
One theodolite.
Three backed thermometers, for tapes.
b. The following tools and materials are used for staking a line:
One hammer.
One hatchet.
One handsaw.
Two mauls.
Two machetes.
10d nails.
Posts and stakes.
Movable tripods.
3-7. Members of a Baseline Party. A baseline party should be staffed with six personnel to include
the front contact man, the rear contact man, the recorder, the front stretcher man, the rear stretcher man,
and the middleman. The party chief acts as the forward contact man unless other experienced personnel
are available; otherwise, the party chief acts as the recorder. The general duties and responsibilities of
the party members are briefly outlined below.
a. The front contact man ensures that conditions affecting the tape as a measuring unit are complied
with. The tape must be in proper equilibrium and under proper tension and support before he makes the
forward mark. He must also accurately read the front thermometer at each measurement.
b. The rear contact man makes the rear contact and reads the rear thermometer. As the tape is
brought up to a new position, he steadies it as the rear staff places it in position and applies tension,
ensuring that the tape does not drag over the rear stake. He advises the rear stretcher man to either ease
off or take up the tape's tension.
c. The recorder should be an experienced man; otherwise, the party chief must frequently inspect
the record, especially where broken grades or setups and setbacks are recorded.
(1) When the tape is advanced 50 meters, its forward end will occasionally fall short of the next
metal strip. When this occurs, make a scratch on the rear metal
3-5
EN0593
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