Geodesy, topographic mapping.
Replaced by Geodetic Datum of 1965 alias 1975 Mapping Adjustment or TM75 (datum code 6300).
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "OSNI 1952", "ellipsoid": { "name": "Airy 1830", "semi_major_axis": 6377563.396, "inverse_flattening": 299.3249646 }, "scope": "Geodesy, topographic mapping.", "area": "United Kingdom (UK) - Northern Ireland (Ulster) - onshore.", "bbox": { "south_latitude": 53.96, "west_longitude": -8.18, "north_latitude": 55.36, "east_longitude": -5.34 }, "id": { "authority": "EPSG", "code": 6188 } }