Triangulation practice: a subsidiary station chosen near a main triangulation station to bypass obstructions is commonly called a satellite/eccentric/false station. Which name is NOT used for such a subsidiary point?

Introduction / Context:
In triangulation surveying, obstacles (buildings, trees, relief) may prevent direct observations from a primary station. A nearby auxiliary point is then selected to carry out the required sightings while mathematically relating it back to the main station.

Given Data / Assumptions:

• Auxiliary points are near the primary station.
• Terminology in classical triangulation texts recognizes several synonyms.
• We must identify the term that is NOT standard for this purpose.

Concept / Approach:
Common synonyms for a nearby auxiliary point are: satellite station, eccentric station, or false station. These reflect the idea that the observed station is not the true main point but a nearby surrogate whose relationship to the main station is known. The term “pivot station” is not a recognized synonym in this context.

Step-by-Step Solution:
List known synonyms: satellite, eccentric, false station.Compare with “pivot station” which refers to rotating supports in instruments, not a subsidiary triangulation point.Therefore, “pivot station” is not used for the auxiliary point.

Verification / Alternative check:
Surveying manuals consistently employ the three accepted synonyms; “pivot” relates to instrument mechanics rather than station classification.

Why Other Options Are Wrong:

• Satellite station: standard term.
• Eccentric station: standard term.
• False station: standard term in some texts.
• Offset station: also used in practical contexts.

Common Pitfalls:
Assuming “pivot” refers to station naming; it does not.

Final Answer:
Pivot station