For the past ten years or so, Coppedge has been known for his extensive work in perpetual motion, now available in book form. This edition features new principles of design and instructions on how to build a detailed experiment that proves perpetual motion principles. Included are dozens of designs including the Tilt Motor, Repeating Lever, Motive Mass Machine, and many others and their variations. This text is frequently updated with new designs and theories, most recently the Not-If-But-When Machines 1 - 4 which has been featured on Wikimedia.