rack perpendicular; a a are the two radius bars on which the brasses are fixed that support the shaft; by this contrivance the wheel C easily moves from one side to the other of the rack F. Fig. 2. is a view of the rack on a larger scale, where C represents the wheel and D the shaft; EE, a sliding bar, on which is fixed the small roller o, serving as a connecting link to keep the wheel C always in gear; for, when the wheel is in gear on the opposite side of the rack, the rolIer o is on the other side of the plate a a; but it will perhaps be more clearly understood by the plan, Fig. 3. where the letters represent the same movement as in the elevation, Fig. 2: This description may be easily understood by those who already possess a little knowledge of a steam-engine. Description of a Steam Engine on the Principle of Savary, operating by a separate Condenser; with other essential Improvements. By Mr. JOHN NANCARROW*, Plate III. Fig. 3. A. The receiver, which may be made either of wood or iron.. BBBB. Wooden or cast-iron pipes for conveying the water to the receiver, and from thence to the penstock. C. The penstock or cistern. D. The water-wheel. E. The boiler, which may be either iron or copper F. The hot-well for supplying the boiler with water. GG. Two cisterns under the level of the water, in which the small bores BB, and the condenser are con tained. HHH. The surface of the water with which the steam engine and water wheel are supplied. * From a learned paper on Mills, in the American Transac tions, IV. page 355. I have not been able to extract the theoreti cal parts of the paper, because the plates and references are too imperfect. |