GEO. P. ROWELL & CO.,

Publishers, No. 40 Park Row, New York.

The Pittsburgh (Pa.) Leader, in its issue of May 29, 1870 says:

"The firm of G. P. Rowell & Co., which issues this interesting and

valuable book, is the largest and best Advertising Agency in the

United States, and we can cheerfully recommend it to the attention

of those who desire to advertise their business SCIENTIFICALLY and

SYSTEMATICALLY in such a way: that is, so as to secure the largest

amount of publicity for the least expenditure of money."

* * * * *

THE CELEBRATED

_COLD-ROLLED SHAFTING._

This Shafting is in every particular superior to any turned Shafting

ever made. It is the most ECONOMICAL SHAFTING to buy, being so very

much stronger than turned Shafting. Less diameter answers every

purpose, causing a great saving in coupling, pulleys and hangers.

It is perfectly round, and made to Whitworth Gage. All who give it a

trial continue to use it exclusively. We have it in large quantities.

Call and examine it, or send for price list.

Address

GEORGE PLACE & CO.,

126 and 128 Chambers st., New York.

* * * * *

_N. Y. MACHINERY DEPOT._

GEORGE PLACE & CO., Manufacturers and Dealers in Wood and Iron Working

Machinery, of every description, Stationary and Portable Engines

and Boilers, Leather and Rubber Belting, and all articles needful in

Machine or Railroad Repair Shops. 126 and 128 Chamber st., New York.

* * * * *

_STURTEVANT BLOWERS._

These are in every particular the best and most perfect Blower ever

made. A full assortment of every size on hand, ready to deliver.

Address

GEORGE PLACE & CO.,

126 and 128 Chamber St., New York.

* * * * *

[Illustration: WROUGHT IRON Beams & Girders]

The Union Iron Mills, Pittsburgh, Pa. The attention of Engineers and

Architects is called to our improved Wrought-iron Beams and Girders

(patented), in which the compound welds between the stem and flanges,

which have proved so objectionable in the old mode of manufacturing,

are entirely avoided, we are prepared to furnish all sizes at terms

as favorable as can be obtained elsewhere. For descriptive lithograph

address Carnegie, Kloman & Co., Union Iron Mills, Pittsburgh, Pa.

* * * * *

MILL OWNERS, ATTENTION.--Our Turbine Water Wheels still ahead. No

complications. Simple, compact, and durable. Prices moderate.

VALENTINE & CO., Ft. Edward, N. Y.

* * * * *

THE WOODWARD STEAM-PUMP MANUFACTURING COMPANY, Manufacturers of the

Woodward Pat. Improved Safety Steam Pump and Fire Engine, Steam,

Water, and Gas Fittings of all kinds. Also Dealers in Wrought-iron

Pipe, Boiler Tubes, etc. Hotels, Churches, Factories, & Public

Buildings heated by Steam. Low Pressure. Woodward Building, 76 and 78

Center st., cor. of Worth st. (formerly of 77 Beekman st., N. Y.) All

parties are hereby cautioned against infringing the Pat. Right of the

above Pump. G. M. WOODWARD, Pres't.

* * * * *

BUERK'S WATCHMAN'S TIME DETECTOR.--Important for all large

Corporations and Manufacturing concerns--capable of controlling with

the utmost accuracy the motion of a watchman or patrolman, as the same

reaches different stations of his beat. Send for a Circular.

J. E. BUERK,

P. O. Box 1,057 Boston, Mass.

N. B.--This detector is covered by two U. S. Patents. Parties using or

selling these instruments without authority from me will be dealt with

according to law.

* * * * *

PORTABLE STEAM ENGINES, COMBINING the maximum of efficiency,

durability and economy, with the minimum of weight and price. They are

widely and favorably known, more than 750 being in use. All warranted

satisfactory or no sale. Descriptive circulars sent on application.

Address

J. C. HOADLEY & CO., Lawrence, Mass.

46. Cortlandt st., New York.

* * * * *

$5 TO $10 PER DAY.

MEN, WOMEN, BOYS and GIRLS who engage in our new business make from

$5 TO $10 PER DAY in their own localities. Full particulars and

instructions sent free by mail. Those in need of permanent, profitable

work, should address at once. GEORGE STINSON & CO., Portland, Maine.

* * * * *

_AGENTS! READ THIS!_

WE WILL PAY AGENTS A SALARY OF $30 PER WEEK and expenses, or allow a

large commission, to sell our new and wonderful inventions.

Address

M. WAGNER & CO., Marshall, Mich.

* * * * *

Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 162 / 194 题