A theodolite is a human-made precision optical instrument designed to measure horizontal and vertical angles with high accuracy. Its parameters are: the telescope assembly (collimator, objective lens, eyepiece with crosshairs), the horizontal circle (azimuth scale, 0–360° graduated ring), the vertical circle (altitude scale, −90° to +90°), the leveling system (tripod, spirit levels or electronic bubble sensors), and the reading mechanism (vernier dial, digital encoder, or micrometer). It persists through standardized optical-mechanical manufacturing, calibration against known angular references, and sustained use in surveying, civil engineering, and geodesy. [formal: theodolitus | substrate: matter | horizon: a life | explicit: yes | epoch: 0.41]
Accepted ontology entry
theodolite
A theodolite is a human-made precision optical instrument designed to measure horizontal and vertical angles with high accuracy. Its parameters are: the telescope assembly (collimator, objective lens, eyepiece with crosshairs), the horizon…
Definition
Why it is in scope
A human-made precision surveying instrument consisting of a telescope mounted on a tripod with horizontal and vertical angular scale systems, built to measure angles in horizontal and vertical planes for mapping, construction, and engineering. Persisted through standardized manufacturing, calibration protocols, and professional use.
Names and aliases
- theodoliteen · CANONICAL
Relations from this entry
- cmrwpvijt00y8soacu0zugfu5INSTANCE_OF →
Theodolite is a specific kind of surveying-instrument: a precision device for measuring horizontal and vertical angles in surveying work. Theodolite IS a surveying-instrument per the category definition — a device calibrated to acquire spatial measurements using sensing elements and reference systems. Removal of surveying-instruments as a class: theodolite would have no category, though it still operates. This is INSTANCE_OF (Law 9), not DEPENDS_ON.
- cmrworua100umsoac348u7b5cDEPENDS_ON →
A theodolite is a precision instrument designed to measure horizontal and vertical angles. Remove the concept of angle and the theodolite's measurement function ceases to operate — it literally measures angles. The removal test passes: no angle concept = no function for a theodolite.
- cmr9uz3vv00elhcxfruyltnd4DEPENDS_ON →
Removal test (Law 8): the theodolite operates as a device for measuring angles. Remove measurement and the theodolite has no function — it cannot operate without the concept of measurement. This is not meta-level (Law 2b): the theodolite's actual working, not just its sayability, requires measurement. Remove measurement and the theodolite is an inert tripod with lenses.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 22, 2026, 11:20 PM UTC
- Content hash
- f15957c6515f261b23608ed943986964b9753ad94f92577a17d27231dcaa1e9a