Index to the Great Trigonometrical Survey of India (1922)

Index to the Great Trigonometrical Survey of India

Survey of India · 1922

An index map from the Survey of India’s 1921–22 report, showing the framework of the Great Trigonometrical Survey. It maps the survey system itself: series, triangulation and longitude work rather than ordinary landscape.

An institutional index

The matching public-domain scan identifies the source as the Report of the Survey of India for 1921–22. The map is therefore not a stand-alone popular atlas plate but an administrative diagram embedded in the Survey’s own annual reporting.

The network behind the map

The one-degree grid and survey symbols organise the country by the operations through which positions were established. Triangulation chains and other geodetic work appear as an infrastructure of measurement laid across the subcontinent.

From Lambton to institution

Placed at the end of the Survey Turn, the index functions as a retrospective epilogue rather than the next chronological step after the 1831 Walker map. The experimental and hazardous early triangulations have become, by 1922, a mature bureaucratic system capable of diagramming its own coverage.

The gaze

This is not merely India mapped; it is the machinery of mapping made visible. Individual surveyors recede behind the Survey of India, while the country is rendered as a lattice of operations, series and calculated positions.

Institutional author

Survey of India, Government of India

Date

1922

Source named by matching scan

Report of the Survey of India for 1921–22

Type

Survey index / geodetic network map

Rights statement on matching scan

Public domain

Local image provenance

Not recorded in the supplied HTML. A matching public-domain scan is linked below, but the HTML does not establish that the local JPG was downloaded from it.

Matching record identifier

Wikimedia Commons file record

Matching catalogue record

Matching public-domain scan on Wikimedia Commons