Unit: metre
Data source: EPSG
Information source: Survey of India professional paper #28; 1939
Revision date: 1996-10-18
Remarks: Used for the 1937 readjustment of Indian triangulation. Clarke's 1865 Indian-British foot ratio (0.99999566) and Benoit's 1898 British inch-metre ratio (39.370113) rounded as 0.30479841 exactly and applied to Everest's 1830 definition taken as a and 1/f