The impulse for creation of centres of technical training came from the British rulers of India, and it arose out of the necessity for the training of overseers for construction and maintenance of public buildings, roads, canals, and ports, and for the training of artisans and craftsmen for the use of instruments, and apparatus needed for the army, the navy, and the survey department. While superintending engineers were mostly recruited from Britain, lower grade craftsmen, artisans and sub-overseers were recruited locally. The necessity to make them more efficient, led to the establishment of industrial schools attached to the Ordnance Factories Board and other engineering establishments.