Lewis Mumford's foundational work of technological history argues that the machine age did not begin with the steam engine or the factory system but in the medieval monastery, where clocks first disciplined human activity to mechanical time. Writing in 1934, Mumford traces how technologies of power, precision, and replication developed over centuries, how they interconnected to produce industrial society, and what that society does to human possibility. Unlike technological determinists, Mumford insists that machines are tools shaped by human choices—the problem is not technology itself but the values that direct its application. He divides technological history into phases—eotechnic, paleotechnic, neotechnic—each characterized by different energy sources, materials, and social relations. The paleotechnic phase, dominated by coal and iron, produced the degradation of industrial capitalism; the emerging neotechnic phase, based on electricity and lighter materials, offered possibilities for a more humane integration of technology and life. Mumford's analysis anticipates later concerns about technology's environmental impact, its concentration of power, and its effect on meaningful work. His writing combines historical scholarship with prophetic urgency, demanding that readers consider what kind of society they want technology to serve. This book helped establish technology studies as a field and remains essential for anyone thinking about how machines shape human possibility—and how human choices shape the machines we build.