STEEL CASTINGS

From 1/4 to 15,000 lb. weight, true to pattern, of unequaled

strength, toughness, and durability. 15,000 Crank Shafts

and 10,000 Gear Wheels of this steel now running prove

its superiority over all other Steel Castings. Send for

circular and price list.

CHESTER STEEL CASTINGS Co., 407 Library St., Phila, Pa.

CARNEGIE BROS & CO

UNION IRON MILLS

PITTSBURGH PA.

WROUGHT IRON BEAMS

CHANNELS TEES & ANGLES

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.

ALAND'S

Silent Injector,

Blower & Exhauster.

Apply to

S. ALAND,

Rome, Oneida

Co., N. Y.

[Illustration]

WOOD-WORKING MACHINERY,

Such as Woodworth Planing, Tonguing, and Grooving

Machines, Daniel's Planers, Richardson's Patent Improved

Tenon Machines, Mortising, Moulding, and

Re-Saw Machines. Eastman's Pat. Miter Machines, and

Wood-Working Machinery generally. Manufactured by

WITHERBY, RUGG & RICHARDSON,

26 Salisbury Street, Worcester, Mass.

(Shop formerly occupied by R. BALL & CO.)

SHAFTS, PULLEYS, HANGERS, ETC.

Full assortment in store for immediate delivery.

WM. SELLERS & CO.,

79 Liberty Street, New York.

PORTER MANUF'G CO.

[Illustration]

[Illustration: The New Economizer Boiler]

The New Economizer,

the only Agricultural Engine with Return Flue

Boiler in use.

Send for circular to

PORTER MFG. Co., Limited,

Syracuse, N. Y.

G. G. YOUNG, Gen. Agt., 42 Cortland St., New York.

Scientific American, Vol. XLIII.—No. 1. [New Series.], July 3, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures · 第 121 / 157 题