r 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.

* * * * *

HEAVY CASTINGS FOR FORGE AND MILL WORK. The M. & T. SAULT CO. Steam
Engine Builders & Founders, New Haven, Conn.

* * * * *

EMPLOYMENT.

$250 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.

* * * * *

A. 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.

* * * * *

McNAB & 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,
THE ALLEN ENGINE.

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.

LATHES, 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 Cove