76/4886 [India]. Trigonometrical survey of India. Lithogr. map w. col. borders by J. Horsburgh, 18 sheets on linen, total measuring 66,5x 101,3 cm., sheets w. various sizes, publ. by Thacker and Co., Bombay, 1828.

- A few (sm.) tears in linen; sl. browned.

= Map 60 of the Great Trigonometrical Survey, a project with the aim to survey the entire Indian subcontinent with scientific precision (1802-1871). The Survey had an enormous scientific impact, being responsible for one of the first accurate measurements of a section of an arc of longitude, and for measurements of the geodesic anomaly which led to the development of the theories of isostasy. This map showing "Parts of District Astragram, Banglore and Chittledroog in Mysore" (see website University of Michigan Library).