Amiya Kumar Bagchi used the data collected by Buchanan– Hamilton to support the thesis of deindustrialisation in the 19th– century India. He examined evidence on handloom spinning and other traditional industry in Gangetic Bihar, an area of eastern India, collected between the years 1809 and 1813 by the East India Company surveyor, Dr. Francis Buchanan Hamilton. Bagchi compared Hamilton’s data with the 1901 Census estimates of the population dependent on industry for the same area