Scientific American Volume Xxiv., No. 12, March 18, 1871 Part 31

EMERSON'S PATENT MOVEABLE TOOTHED CIRCULAR SAWS]

And Perforated Circular and Long Saws. Also Solid Saws of all kinds.

No. 1 Ferry St., cor. Gold street, New York. Branch Office for Pacific Coast, No. 606 Front street, San Francisco, Cal.

_MACHINE SCREWS,_ For all purposes, with square, round, and hexagon heads. A. W. GIFFORD & CO., Worcester, Ma.s.s.

PATENT COLD ROLLED SHAFTING.

The fact that this Shafting has 75 per cent greater strength, a finer finish, and is truer to gage, than any other in use, renders it undoubtedly the most economical. We are also the sole manufacturers of the CELEBRATED COLLINS PAT. COUPLING, and furnish Pulleys, Hangers, etc., of the most approved styles. Price Lists mailed on application to

JONES & LAUGHLINS, 120 Water street, Pittsburgh, Pa.

---> Stocks of this Shafting in store and for sale by

FULLER, DANA & FITZ, Boston, Ma.s.s.

GEO. PLACE & CO., 126 Chambers street, N. Y.

[Ill.u.s.tration:

SCHLENKER'S PATENT BOLT CUTTER NEW INVENTION. ADDRESS, HOWARD IRON WORKS, BUFFALO, N. Y.

_STEAM SUPER-HEATER,_

For Saving Fuel, and supplying Dry Steam of any desired temperature.

Safe, durable, easily attached.

H. W. BULKLEY Engineer, 98 Liberty st., N. Y.

FOR CIRCULAR OF TREMPER'S PATENT VARIABLE CUT-OFF, for high and low pressure Steam Engines, address

PUSEY JONES & CO. Wilmington Delaware.

HARRISON SAFETY BOILER.

First-cla.s.s Medal, World's Fair, London, 1862. And American Inst.i.tute Fair, New York, 1869.

Over 1,000 Boilers in Use.

WESTON'S PATENT DIFFERENTIAL

PULLEY BLOCKS.

75,000 IN USE.

Address HARRISON BOILER WORKS, PHILADELPHIA, PA.

or, JOHN A. COLEMAN, Agent, 110 Broadway, New York, and 139 Federal st., Boston.

_DOYLE'S_ PATENT DIFFERENTIAL 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.

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.