Book excerpt: Over five hundred mechanisms and devices from the first century of the Industrial Revolution. Starting from simple pulleys and levers, this classic book works its way through basic engineering principles to Otis’s elevator safety stop, Colt’s revolver action, and Ferguson’s mechanical paradox. Each mechanism is illustrated with a clear diagram, and a description of its use and operation. Fascinating and addictive reading for anyone with an interest in mechanics or engineering. This ebook edition includes an active index, reflowable text, and over 500 illustrations.