Elevators, Freight and Passenger, Shafting, Pulleys and Hangers. L. S. Graves & Son, Rochester, N.Y. Steam Engines; Eclipse Safety Sectional Boiler. Lambertville Iron Works, Lambertville, N. J. See ad. p. 349. Magic Lanterns, Stereopticons, and Views of all kinds and prices for public exhibitions. A profitable business for a person with small capital. Also lanterns for home amusement, etc. Send stamp for 116 page catalogue to McAllister, M'f'g Optician, 49 Nassau St., New York. Lenses for Constructing Telescopes, as in Sci. Am. Supplement, No. 252, $6.50 per set; postage, 9 cts. The same, with eye piece handsomely mounted in brass, 8.00. McAllister, M'f'g Optician, 49 Nassau St., N. Y. For best low price Planer and Matcher, and latest improved Sash, Door, and Blind Machinery, Send for catalogue to Rowley & Hermance, Williamsport, Pa. The only economical and practical Gas Engine in the market is the new "Otto" Silent, built by Schleicher, Schumm & Co., Philadelphia, Pa. Send for circular. Penfield (Pulley) Blocks, Lockport N. Y. See ad. p. 381. 4 to 40 H. P. Steam Engines. See adv. p. 281. Tyson Vase Engine, small motor. 1-33 H. P., efficient and non-explosive: price $50 See illus. adv., page 380. For Yale Mills and Engines, see page 381. Lightning Screw Plates and Labor-saving Tools. p. 333. * * * * * PATENTS ISSUED TO AMERICANS. FROM NOVEMBER 9 TO NOVEMBER 12, 1880, INCLUSIVE. Book binding, L. Finger, Boston, Mass. Draining and sewerage. G. E. Waring Newport, R. I. Electric gas lighter, G. D. Bancroft. Boston, Mass. Electric signal. EH Johnson _et al._, Menlo Park, N. J. Horse nail manufacture, S. S. Putnam. Boston, Mass. Hygienic confection, T. S. Lambert _et al._, New York city. Looms, F. O. Tucker, Hartford, Conn Reflectors for lamps. J. S. Goldsmith, New York city. Railroad vehicles, E. R. Esmond _et al._. New York city. Sewing machine. G. F. Newell, Greenfield. Mass. Steam boilers, D. Sutton. Cincinnati. Ohio. Steam boilers, W. D. Dickey, New York city. Toy money box, J. E. Walter. New York city. Trucks, hand., E. J. Lyburn, Fredericksburg, U. S. A. * * * * * NOTES AND QUERIES HINTS TO CORRESPONDENTS. No attention will be paid to communications unless accompanied with the full name and address of the writer. Names and addresses of correspondents will not be given to inquirers. We renew our request that correspondents, in referring to former answers or articles, will be kind enough to name the date of the paper and the page, or the number of the question. Correspondents whose inquiries do not appear after a reasonable time should repeat them. If not then published, they may conclude that, for good reasons, the Editor declines them.