In 1909 Mohandas Karamchand Gandhi, on his way back to South Africa from London, wrote his now celebrated tract "Hind Swaraj," laying out his vision for the future of India and famously rejecting the technological innovations of Western civilization. Despite his protestations, Western technology endured and helped to make India one of the leading economies in our globalized world. Few would question the dominant role that technology plays in modern life, but to fully understand how India first advanced into technological modernity, argues David Arnold, we must consider the technology of the...