Between July 1896 and February 1897, with the assistance of Sub-Inspectors Azizul Haque and Hemchandra Bose, Henry developed a system of fingerprint classification enabling fingerprint records to be organised and searched with relative ease. It was Haque who was primarily responsible for developing a mathematical formula to supplement Henry's idea of sorting in 1,024 pigeon holes based on fingerprint patterns. Years later, both Haque and Bose, on Henry's recommendation, received recognition by the British Government for their contribution to the development of fingerprint classification.