Pulley Blocks,

The celebrated Doyle Blocks have taken premiums over the differential Blocks of all other makers at every Fair where they have been exhibited at the same time. When you buy, see that the Blocks are marked J. J. DOYLE. Pat. Jan. 8, 1861. All others are infringements.

SAMUEL HALL'S SON & CO.,
SOLE MANUFACTURERS.
229 West 10th street, New York.

For Forge and
Mill Work. The M. & T. SAULT CO. Steam Engine Builders & Founders, New Haven, Conn.

EMPLOYMENT.

A MONTH with Stencil Dies.
Samples free. Address

S. M. SPENCER Brattleboro Vt.

THE

Tanite Emery Wheel.

Does not Glaze, Gum, Heat, or Smell. Address

THE TANITE CO.,

Stroudsburg, Monroe Co., Pa.

S. & J. GEAR & CO., Boston, furnish every description of Wood and Iron Working Machinery and Supplies. The best in use, regardless of maker, at lowest possible rates.

Working Models

And Experimental Machinery, Metal, or Wood, made to order, by

J. F. WERNER 62 Center st. N. Y.

cNAB & HARLAN, Manufacturers of Wrought Iron Pipe and Fittings, Brass Cocks, Valves, Gage Cocks, Whistles, Water Gages, and Oil Cups, Harlin's Patent Lubricator, Plumber's Brass Work, Getty's Patent Pipe Cutter, Getty's Patent Proving Pump and Gage. No. 86 John st., New York.

THE

Allen Engine Works,

Fourth avenue and 130th and 131st sts., New York city Manufacturers of

• Porter's Governor,
• The Allen Boiler, and
• Standard Straight Edges, Surface Plates, and
• Angle Plates.

Four first premiums were awarded to us at the Fair of the American Institute, 1870.

Send for our illustrated circular.

L. W. Pond—New Tools.

EXTRA HEAVY AND IMPROVED PATTERNS.

ATHES, PLANERS, DRILLS, of all sizes; Vertical Boring Mills, ten feet swing, and under; Milling Machines, Gear and Bolt Cutters; Hand Punches and Shears for Iron.

Office and Warerooms, 98 Liberty st., New York; Works at Worcester, Mass.

A. C. STEBBINS, New York, Agent.

WATER-PROOF

BUILDING PAPER

(No Tar), for Roofing, Sheathing, Ceilings, Oil-cloths, Shoe Stiffenings, Tags, Trunks, Cartridges, Blasting, Pass-book Covers, Grain and Flour Bins, etc., for sale by

J. HUNTER, Jr.,

Paper Warehouse, 59 Duane st., New York.

Scientific American