Established 1858. =87 MAIDEN LANE, NEW YORK.= CHICAGO. PHILADELPHIA. LONDON.]

Wanted 50,000 Sawyers and Lumbermen to send us their full address for a copy of Emerson's [Illustration] Book of SAWS. We are first to introduce NATURAL Gas for heating and tempering Saws with wonderful effect upon improving their quality and toughness, enabling us to reduce prices. Address EMERSON, SMITH & CO. (Ltd.), Beaver Falls, Pa.

Scientific American, Volume 56, No. 9, February 26, 1887 — Part 75

The most successful Lubricator for Loose Pulleys in use. =VAN DUZEN'S PATENT LOOSE PULLEY OILER.= Highly recommended by those who have used them for the past two years. Prices very reasonable. Every user of machinery should have our "Catalogue No. 55;" sent free. VAN DUZEN & TIFT, Cincinnati. O.

Scientific American, Volume 56, No. 9, February 26, 1887 — Part 75

By using Soper's Instantaneous Guide. Any person can play a tune on either instrument at once without the aid of a teacher. No previous knowledge of music whatever required. Send for book of testimonials free. Address =G. K. HEARNE & CO.,= P. O. Box 1487, New York.

Scientific American, Volume 56, No. 9, February 26, 1887 — Part 75

Chandler & Farquhar, 177 Washington St., BOSTON.

Agents for Fay's "Yankee" CALIPERS AND =Barnes' Foot Power Machinery,= AND DEALERS IN =Machinists' Supplies of Every Kind.= Send two stamps for illus. catalogue.

Address JOHN A. ROEBLING'S SONS, Manufacturers, Trenton, N. J., or 117 Liberty Street, New York.

Wheels and Rope for conveying power long distances. Send for circular.

--As it is the Packing by which all others are compared. Accept no packing as JENKINS PACKING unless stamped with our "Trade Mark."

=JENKINS BROS. { 71 John Street, N. Y. { 105 Milk Street, Boston. { 13 So. Fourth St., Phila.=

Best in principle, workmanship, and materials. An unequaled small Motor adapted to all uses. When the motor is not at work, the expense of running it ceases. =Simple, Safe, Economical, Durable. No extra insurance.= Four sizes: 1 H. P., ½ H. P., 1 man power, and Dental Engine. These Engines are especially suited for Gasoline Gas for country use.

[Illustration] _Send for Illustrated Catalogue._

=ECONOMIC MOTOR CO., Office and Salesrooms 34 Dey St. N. Y.=

=Absolutely Fire Proof. BRAIDED PACKING, MILL BOARD, SHEATHING, CEMENT, FIBRE AND SPECIALTIES. CHALMERS-SPENCE CO., FOOT E. 8TH ST., N. Y.=

[Illustration: BRADLEY'S INSULATED AIR COVERINGS]