Rubber Back Square Packing

BEST IN THE WORLD.

For Packing the Piston Rods and Valve Stems of Steam Engines and Pumps.

B represents that part of the packing which, when in use, is in contact with the Piston Rod.

A the elastic back, which keeps the part B against the rod with sufficient pressure to be steam-tight, and yet creates but little friction.

This Packing is made in lengths of about 20 feet, and of all sizes from 1/4 to 2 inches square.

JOHN H. CHEEVER, Treas. NEW YORK BELTING & PACKING CO., 37 & 38 Park Row, New York.

The Stearns Manufacturing Co.,

ERIE, PENNSYLVANIA, make a specialty of improved

SAW MILL MACHINERY.

Designed in its construction for producing lumber economically and rapidly. Plans and estimates for Mills of any capacity furnished on request. Also build ENGINES, BOILERS, AND MACHINERY IN GENERAL.

Forster's Rock & Ore Breaker And Combined Crusher And Pulverizer

The simplest machine ever devised for the purpose.

Parties who have used it constantly for six years testify that it will do double the work of any other Crusher, with one-third the Power, and one-half the expense for keeping in repair. The smaller sizes can be run with Horse Power.

Address TOTTEN & CO., Pittsburgh, Pa.

The Belmontyle Oil

Prevents Rust, Tarnish, etc., on Firearms, Machinery, Tools, Cutlery, Safes, Saws, Skates, Stoves, Hardware, etc., without injury to the polish. In use over 10 years. Highest Testimonials. Samples 50 cents, three for $1.00, sent free of expressage. Send for circular.

BELMONTYLE OIL CO.,
SOLE MANUFACTURERS,
150 Front Street, New York.

The attention of Architects, Engineers, and Builders is called to the great decline in prices of wrought

STRUCTURAL IRON.

It is believed that, were owners fully aware of the small difference in cost which now exists between iron and wood, the former, in many cases, would be adopted, thereby saving insurance and avoiding all risk of interruption to business in consequence of fire. Book of detailed information furnished to Architects, Engineers, and Builders, on application.

MICROSCOPES,
TELESCOPES, FIELD GLASSES,
MAGIC LANTERNS,
ANEROID BAROMETERS,
SPECTROSCOPES,
DRAWING INSTRUMENTS,
PHILOSOPHICAL & CHEMICAL
APPARATUS.

Catalogues as follows sent on application: Part 1, Mathematical Instruments, 162 pp.; Part 2, Optical Instruments, 186 pp.; Part 3, Magic Lanterns, 112 pp.; Part 4, Philosophical and Chemical Apparatus, 160 pp. JAMES W. QUEEN & CO. 924 Chestnut St., Philadelphia, Pa.

"Reliable"

Engines a complete success. Prices still 40 per cent. below those of other makers. Unequaled for efficiency, simplicity, and durability. Prices from $250 for 10 H. P., to $400 for 30 H. P. All complete, with Governor, Pump, and Heater. Address, for circular,

HEALD, SISCO & CO., Baldwinsville, N. Y.

Universal Grinder

These Grinders consist of a series of disks with beveled edges locked together on a shaft. They revolve towards each other at different rates of speed. They combine strength and durability. No friction; hence no heat. They will grind all kinds of Grain, also Quartz Rocks, Ores, Gypsum, Brimstone Shavings, Shells, Brick Clay, Cork, Rubber, Bone, Oil Cake, Flax Seed, Cotton Seed, and any number of articles in use by manufacturers and farmers. These Grinders are disposed of on reasonable terms. Send for Illustrated Catalogue with terms. NEWELL & CHAPIN, foot of West 19th Street, New York.

23 Sizes of Direct, 24 Sizes of Boilers, and the best Indirect Radiation.

Send for circulars.

EUREKA STEAM HEATING CO. ROCHESTER, N. Y.

Otis'. Safety Hoisting. Machinery

OTIS BROS. & CO., No. 348 Broadway, New York.

John R. Whitley & Co

European Representatives of American Houses, with First-class Agents in the principal industrial and agricultural centers and cities in Europe. London, 7 Poultry, E. C. Paris. 8 Place Vendême. Terms on application. J. R. W. & Co. purchase Paris goods on commission at shippers' discounts.

Roots' New Iron Blower

Positive Blast. Iron Revolvers, Perfectly Balanced Is Simpler, And Has Fewer Parts Than Any Other Blower

P. H. & F. M. ROOTS, Manuf'rs, CONNERSVILLE, IND.

S. S. TOWNSEND, Gen. Agt., 6 Cortlandt St., 8 Dey Street, NEW YORK.

WM. COOKE, Selling Agt., 6 Cortlandt Street, NEW YORK.

JAS. BEGGS & CO., Selling Agts., 8 Dey Street, NEW YORK.

SEND FOR PRICED CATALOGUE.

Proposals For Mail Locks

POST OFFICE DEPARTMENT,
WASHINGTON. D. C., October 23, 1880.

SEALED PROPOSALS will be received at this Department, until 12 o'clock, noon, on the 26th day of January, 1881, for furnishing a new kind of mail locks and keys for the sole and exclusive use of the United States through registered mails.

As the public exposure and searching examination necessary to intelligent bidding on any prescribed model of a lock and key would tend to impair, if not entirely destroy, the further utility of such locks and keys for the purposes of the mails, the Postmaster General prescribes no model or sample for bidders, but relies for a selection on the mechanical skill and ingenuity which a fair competition among inventors, hereby invited, may develop in samples submitted by them.