AMERICAN SAW CO., MANUFACTURERS OF

[Illustration:

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, Mass.

* * * * *

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, Mass.

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

* * * * *

[Illustration:

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-class Medal, World's Fair, London, 1862. And American Institute

Fair, New York, 1869.

Over 1,000 Boilers in Use.

Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 182 / 194 题