and he very modestly suggests a method by which he could be approached on the subject of selling the secret of his machine for one hundred thousand rix-thalers, and points out the great importance to the public of such an acquisition. The book contains a cut of his device with the following very brief explanation: [Illustration] Number 1 shows the entire size of the wheel; 2, a cord wound round the principal axle; 3, the wheel or pulley to guide the cord; 4, the cord passed through a window and over 5, another pulley; 6, the box of stones raised or lowered; 7, the lock to prevent motion; 8, the pendulum with three weights; 9, a winch-handle acting on the pendulum; and 10, shows above and below transparent, so that the machine stands clear and can be moved about. In 1720 the following article was contributed to and published in the "Gentleman's Magazine," concerning the Orffyrean Wheel: MR. URBAN: Being an admirer of improvements in mechanics and desirous of seeing the perpetual motion discovered, I was much pleased on reading, some time ago, an account of the automaton constructed by Orffyreus in two letters, one from Professor 's Gravesande to Sir Isaac Newton, the other from Baron Fischer to Dr. Desaguliers, with the testimonial of the Landgrave of Hesse-Cassel (who had seen the inside of it) in favor of its construction. To which are added some remarks by William Kenrick, the writer of the pamphlet, who takes that opportunity to propose a subscription for a similar machine, which he says he has contrived and denominated a Rotator.