The publishers of this paper guarantee to advertisers a circulation of not less than 50,000 copies every weekly issue.

Fifth Edition Just Ready.

The Complete Practical Machinist

Embracing Lathe Work, Vise Work, Drills and Drilling,Taps and Dies, Hardening and Tempering, the Makingand Use of Tools, etc., etc. By Joshua Rose. Illustratedby 130 engravings. Fifth edition, revised. Inone vol., 12mo., 376 pages. Price $2.50 by mail, free ofpostage.

CONTENTS: Chapter I. Lathe and Machine Tools.II. Cutting Speed and Feed. III. Boring Tools for LatheWork. IV. Screw-cutting Tools. V. General Observationson Lathe Work. VI. Turning Eccentrics. VII.Hand Turning. VIII. Drilling in the Lathe. IX. BoringBars. X. Laps. XI. Twist Drills. XII. Tool Steel.XIII. Taps and Dies. XIV. Vise-work Tools. XV.Fitting Connecting Rods. XVI. Milling Machines andMilling Tools. XVII. To Calculate the Speed of Wheels,Pulleys, etc. XVIII. The Slide Valve. XIX. How toSet a Slide Valve. XX. Pumps Index.

We also publish:

The Modern Practice of American Machinistsand Engineers. By Egbert P. Watson. Illustratedby 86 engravings. 12mo, $2 50

The above or any of our Books sent by mail, freeof postage, at the publication price.

Our new and enlarged CATALOGUE OF PRACTICALAND SCIENTIFIC BOOKS—96 pages, 8vo—sent free to anyone who will furnish his address.

HENRY CAREY BAIRD & CO.,

Industrial Publishers, Booksellers, and Importers,
810 Walnut St., Philadelphia, Pa.

FOR SALE,

A full set of Patent Office Reports, from 1849 to 1872.
Price $60. Apply to C. M. ALEXANDER, Washington, D. C.

1880 1880

Pittsburgh Exposition Society.

THE FOURTH

EXPOSITION AND FAIR

Will open to the public Thursday, September 2, and remainopen day and evening (Sundays excepted) untilSaturday, October 9th, 1880.

Blank forms of application for space, Prospectus, andPremium list may be had by addressing the secretary.

Exhibitors are earnestly requested to make early applicationfor space, thus enabling the managers to betterarrange the whole Exhibition.

New Machinery Hall; new Engine and Boilers.

Manufacturers and Inventors should avail themselvesof the unsurpassed facilities offered by this Expositionfor the introduction of new machinery to the public.

Office, GERMANIA BANK BUILDING, 89 Wood St.

P. O. BOX 895.

E. P. YOUNG, I. C. PATTERSON,
General Manager. Secretary.


JOHN D. BAILEY, Asst. Manager and Cashier.

Cigar Box Lumber,

MANUFACTURED by our NEW PATENT PROCESS.

The Best in the World.

SPANISH CEDAR,

MAHOGANY,

POPLAR.

Also thin lumber of all other kinds, ⅛ to ½ in., at correspondingprices. All qualities. Equal in all respects toany made, and at prices much under any to be obtainedoutside of our establishment. Send for price list.

GEO W. READ & CO.,

186 to 200 Lewis Street, N. Y.

MOSQUITO CATCHER.

Will clear your room in a few minutes without smoke,soil, or grease. Price 50 cents. Send for circular. Agentswanted everywhere. Good terms. L. T. JONES,

166 Light Street, Baltimore, Md.

Roots' New Iron Blower.

POSITIVE BLAST.

IRON REVOLVERS, PERFECTLY BALANCED

IS SIMPLER, AND HAS

FEWER PARTS THAN ANY OTHER BLOWER.

P. H. & F. M. ROOTS, Manuf'rs,CONNERSVILLE, IND.

S. S. TOWNSEND, Gen. Agt.,{6 Cortlandt St.,
8 Dey Street,		}NEW
YORK.
WM. COOKE, Selling Agt., 6 Cortlandt Street,
JAS. BEGGS & CO., Selling Agts., 8 Dey Street,

SEND FOR PRICED CATALOGUE.

FOUR SIDED MOULDER, WITH OUTSIDE BEARING.

We manufacture 5 sizes of these moulders.

Also Endless Bed Planers,Mortisers and Borers. TenoningMachines, Sash Dovetailers.Blind RabbetingMachines. Also a largevariety of other woodworking machines.

Address
LEVI HOUSTON, Montgomery, Pa.


STEAM PUMPS.

THE NORWALK IRON WORKS CO.,

SOUTH NORWALK, CONN.



THE BLAKE "LION AND EAGLE" CRUSHER, A patented improvement of the former "New Pattern" Blake machine. Has much greater efficiency than the old. It requires only about half the power to drive, and is transported at much less expense (the size most used weighing several thousand pounds less than the unimproved machine). It requires less than half the time in oiling and other manipulation, and less than half the expense for repairs. Address E. S. BLAKE & CO., Pittsburgh, Pa., Sole Proprietors and Manufacturers.

Delamater Steam Pumps

For every variety of work

WATERWORKS PUMPING ENGINES

DELAMATER IRON WORKS

Boiler Makers, Engine Builders,and Founders,

Office, No. 10 CORTLANDT ST.,

Works, Foot of W. 18th St., North River, New York.

ESTABLISHED 1841.

Model Engines

Complete sets of

CASTINGS

for making smallModel steam Engines 1½ in. bore, 3 in. stroke, price, $4;ditto 2 in. bore, 4 in. stroke, price, $10, same style as cut.Gear Wheels and Parts of Models. All kinds of SmallTools and Materials. Catalogue Free. GOODNOW &WIGHTMAN, 176 Washington Street, Boston, Mass.

STUTTERING CURED by Bates' Appliances. Sendfor description to SIMPSON & Co., Box 2236, New York.

SPARE THE CROTON AND SAVE THE COST.

Driven or Tube Wells

furnished to large consumers of Croton and RidgewoodWater. WM. D. ANDREWS & BRO., 235 Broadway, N. Y.,who control the patent for Green's American Driven Well.

THE DRIVEN WELL.

Town and County privileges for making DrivenWells and selling Licenses under the establishedAmerican Driven Well Patent, leased by the yearto responsible parties, by

WM. D. ANDREWS & BRO.,

235 BROADWAY, NEW YORK.

For steep or flat roofs. Applied by ordinary workmenat one-third the cost of tin. Circulars and samples free.

Agents Wanted. T. NEW, 32 John Street, New York.

XX COT (not painted, White Duck) $2.

Makes a perfect bed. No mattress or pillows required.Better than a hammock, as it fits the body as pleasantly,and lies straight. Folded or opened instantly. Self-fastening.It is just the thing for hotels, offices, cottages, camp-meetings,sportsmen, etc. Good for the lawn, piazza, or"coolest place in the house." Splendid for invalids or children.Sent on receipt of price, or C. O. D. For 50 cts.extra, with order, I will prepay expressage to any railroadstation east of Mississippi River and north of Masonand Dixon's line. For 75 cents, in Minnesota, Missouri,and Iowa.

HERMON W. LADD, 108 Fulton St., Boston;207 Canal St., New York; 165 North Second St.,Phila.; 94 Market St., Chicago. Send for Circulars.


BEST IN THE WORLD

For Packing the Piston Rods and Valve Stems of Steam Engines and Pumps.


B represents that part of the packing which, when in use, is in contact with the Piston Rod.

A the elastic back, which keeps the part B against the rod with sufficient pressure to be steam-tight, and yetcreates but little friction.

This Packing is made in lengths of about 20 feet, and of all sizes from 1/4 to 2 inches square.

JOHN H. CHEEVER, Treas.

NEW YORK BELTING & PACKING CO., 37 & 38 Park Row, New York.

JOHN R. WHITLEY& CO.

European Representatives of American Houses, withFirst-class Agents in the principal industrial and agriculturalcenters and cities in Europe. London, 7 Poultry, E. C.Paris, 8 Place Vendôme. Terms on application.J. R. W. & Co. purchase Paris goods on commission atshippers' discounts.

Grain Speculation

in large or small amounts. $25 or $25,000. WriteW. T. SOULE & CO., Commission Merchants,130 La Salle St., CHICAGO. ILL., for Circulars.

TELEPHONE Works 1 mile.Price $3.50. Pat'd.
Circulars free. HOLCOMB & CO., Mallet Creek, Ohio.

Johnson's Patent Universal Lathe Chuck.

Lambertville Iron Works, Lambertville, N. J.

Green House
Heating and
Ventilating
Apparatus.

Base Burning
Water Heaters.

For Small Conservatories.

HITCHINGS & CO.,

No. 233 Mercer Street,
New York.

Engine Lathes, Planers, Drills, &c.

DAVID W. POND, Worcester, Mass.

Lathes, Planers Shapers

Drills, Bolt and Gear Cutters, Milling Machines. Special
Machinery. E. GOULD & EBERHARDT, Newark, N. J.

BUCK
ET PLUNGER STEAM PUMPS,
FOR EVERY DUTY.
VALLEY MACHINE CO.,
EASTHAMPTON, MASS.

Steel Castings

From ¼ to 15,000 lb. weight, true to pattern, of unequaledstrength, toughness, and durability. 15,000 Crank Shaftsand 10,000 Gear Wheels of this steel now running proveits superiority over all other Steel Castings. Send forcircular and price list.

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

The attention of Architects, Engineers, and Buildersis called to the great decline in prices of wrought

STRUCTURAL IRON.

It is believed that, were owners fully aware of the smalldifference in cost which now exists between iron andwood, the former, in many cases, would be adopted,thereby saving insurance and avoiding all risk of interruptionto business in consequence of fire. Book of detailedinformation furnished to Architects, Engineers,and Builders, on application.

Wood-Working Machinery,

Such as Woodworth Planing, Tonguing, and GroovingMachines, Daniel's Planers, Richardson's Patent ImprovedTenon Machines, Mortising, Moulding, andRe-Saw Machines. Eastman's Pat. Miter Machines, andWood-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.

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.

Forster's Rock & Ore Breaker and Combined Crusher and Pulverizer.

The simplest machine ever devised for the purpose.

Parties who have used it constantly for six years testify that it will do double the workof any other Crusher, with one-third the Power, and one-half the expense for keeping inrepair. The smaller sizes can be run with Horse Power.

Address TOTTEN & CO., Pittsburgh Pa.

STEAM PUMPS.

HENRY R. WORTHINGTON.

239 Broadway, N. Y. 83 Water St., Boston.

709 Market St., St. Louis, Mo.

The Worthington Pumping Engines for WaterWorks—Compound, Condensing or Non-Condensing.Used in over 100 Water-Works Stations.

Worthington Steam Pumps of all sizes and for allpurposes.

Prices below those of any
other steam pump in
the market.

Water Meters. Oil Meters.

KNOW THYSELF.

The untold miseries that resultfrom indiscretion in early lifemay be alleviated and cured.Those who doubt this assertionshould purchase the new medicalwork published by the PEABODYMEDICAL INSTITUTE, Boston,entitled THE SCIENCE OFLIFE; or, SELF-PRESERVATION.Exhausted vitality,nervous and physical debility, orvitality impaired by the errors ofyouth, or too close application to business, may be restoredand manhood regained.

Two hundredth edition, revised and enlarged, justpublished. It is a standard medical work, the best inthe English language, written by a physician of greatexperience, to whom was awarded a gold and jeweledmedal by the National Medical Association. It containsbeautiful and very expensive engravings. Threehundred pages, more than 50 valuable prescriptions forall forms of prevailing disease, the result of many yearsof extensive and successful practice, either one ofwhich is worth ten times the price of the book. Boundin French cloth; price only $1, sent by mail, postpaid.

The London Lancet says: "No person should bewithout this valuable book. The author is a noblebenefactor."

An illustrated sample sent to all on receipt of 6 centsfor postage.

The author refers, by permission, to Hon. P. A. BISSELL, M.D.,prest. of the National Medical Association.Address Dr. W. H. PARKER, No. 4Bulfinch Street, Boston, Mass. Theauthor may be consulted on all diseasesrequiring skill and experience.HEAL
THYSELF

EXTRA BARGAINS.

Town rights, $10; county, $25. Best novelty yet manufactured.If you want to make money, address, withstamp,

J. H. MARTIN, Hartford, N. Y.

"The 1876 Injector."

Simple, Durable, and Reliable. Requires no specialvalves. Send for illustrated circular.

WM. SELLERS & CO., Phila.

CAVEATS, COPYRIGHTS, LABELREGISTRATION, ETC.

Messrs. Munn & Co., in connection with the publicationof the Scientific American, continue to examineImprovements, and to act as Solicitors of Patents forInventors.

In this line of business they have had over thirtyyears' experience, and now have unequaled facilitiesfor the Preparation of Patent Drawings, Specifications,and the Prosecution of Applications for Patents in theUnited States, Canada, and Foreign Countries. Messrs.Munn & Co. also attend to the preparation of Caveats,Registration of Labels, Copyrights for Books, Labels,Reissues, Assignments, and Reports on Infringementsof Patents. All business intrusted to them is donewith special care and promptness, on very moderateterms.

We send free of charge, on application, a pamphletcontaining further information about Patents and howto procure them; directions concerning Labels, Copyrights,Designs, Patents, Appeals, Reissues, Infringements,Assignments, Rejected Cases, Hints on the Saleof Patents, etc.

Foreign Patents.—We also send, free of charge, aSynopsis of Foreign Patent Laws, showing the cost andmethod of securing patents in all the principal countriesof the world. American inventors should bear inmind that, as a general rule, any invention that is valuableto the patentee in this country is worth equally asmuch in England and some other foreign countries.Five patents—embracing Canadian, English, German,French, and Belgian—will secure to an inventor the exclusivemonopoly to his discovery among about onehundred and fifty millions of the most intelligentpeople in the world. The facilities of business andsteam communication are such that patents can be obtainedabroad by our citizens almost as easily as athome. The expense to apply for an English patent is$75; German, $100; French, $100; Belgian, $100; Canadian, $50.

Copies of Patents.—Persons desiring any patentissued from 1836 to November 20, 1866, can be suppliedwith official copies at reasonable cost, the price dependingupon the extent of drawings and length ofspecifications.

Any patent issued since November 20,1866, at whichtime the Patent Office commenced printing the drawingsand specifications, may be had by remitting tothis office $1.

A copy of the claims of any patent issued since 1836will be furnished for $1.

When ordering copies, please to remit for the sameas above, and state name of patentee, title of invention,and date of patent.

A pamphlet, containing full directions for obtainingUnited States patents sent free. A handsomely boundReference Book, gilt edges, contains 140 pages andmany engravings and tables important to every patenteeand mechanic, and is a useful handbook of referencefor everybody. Price 25 cents, mailed free.

Address

MUNN & CO.,
Publishers Scientific American,

37 Park Row, New York.

BRANCH OFFICE—Corner of F and 7th Streets,Washington, D. C.

FOR SALE.—PLYMOUTH MACHINE

Works, Engine, and Saw Mill. Patterns on hand. Localitygood. For particulars, call on or address the works.Plymouth Machine Works, Plymouth, Richland Co., O.

Holly's Improved Water Works.

Direct Pumping Plan. Advantages: 1. Secures byvariable pressure a more reliable water supply for allpurposes. 2. Less cost for construction. 3. Less costfor maintenance. 4. Less cost for daily supply for alluse of Holly's Improved Pumping Machinery. 5. Affordsthe best fire protection in the world. 6. Largelyreduces insurance risks and premiums. 7. Dispenseswith fire engines, in whole or in part. 8. Reduces firedepartment expenses. For information, address the

HOLLY MANUFACTURING CO., Lockport, N. Y.,

Or PARK BENJAMIN & BRO., Gen. Agents,

49 and 50 Astor House, N. Y. City.


Established 1844.

_______

JOSEPH C. TODD,

Successor to TODD & RAFFERTY,

PATERSON, N. J.,

Engineer and Machinist.

Flax, Hemp, Jute, Rope, Oakum,and Bagging Machinery. Steam Engines,Boilers, etc. Sole Agent forMayher's New Patent Acme SteamEngine and Force Pumps combined.Also owner and exclusive manufacturerof

THE NEW

Baxter Patent Portable Steam Engine.

These engines are admirably adapted to all kinds oflight power for driving printing presses, pumping water,sawing wood, grinding coffee, ginning cotton, and allkinds of agricultural and mechanical purposes, and arefurnished at the following low prices:

1 Horse Power,$1501½ Horse Power,$190
2 Horse Power,2452½ Horse Power,275
3 Horse Power.2904 Horse Power,350

Send for descriptive circular. Address

J. C. TODD,

PATERSON, N. J.

Or No. 10 Barclay St., New York.

The Asbestos Packing Co.,

Miners and Manufacturers of Asbestos,

BOSTON, MASS.,

OFFER FOR SALE:

PATENTED
"
"
"
"
"
"
"
ASBESTOS
"
"
"
"
"
"
"
 ROPE PACKING,
LOOSE "
JOURNAL "
WICK "
MILL BOARD,
SHEATHING PAPER,
FLOORING FELT,
CLOTH.

COLUMBIA BICYCLE.

A practical road machine. Indorsedby the medical profession as the mosthealthful of outdoor sports. Send 3cent stamp for 24 page catalogue, withprice list and full information, or 10cents for catalogue and copy of TheBicycling World.

THE POPE M'F'G CO.,

89 Summer Street, Boston, Mass.

MACHINISTS' TOOLS.

New and Improved Patterns.

Send for new illustrated catalogue.

Lathes, Planers, Drills, &c,

NEW HAVEN MANUFACTURING CO.,

New Haven, Conn.

LIQUID PAINTS, ROOFING, BOILER COVERINGS,

Steam Packing, Sheathings, Fireproof Coatings, Cements,
send for samples, illustrated pamphlet, and price list.

H. W. JOHNS M'F'G CO., 87 MAIDEN LANE, N. Y.

The George Place Machinery Agency

Machinery of Every Description.
121 Chambers and 103 Reade Streets, New York.

DIES FOR EVERY PURPOSE.

STILES & PARKER PRESS CO., Middletown, Ct.

BI-SULPHIDE OF CARBON. E. R. TAYLOR,
Cleveland, O.

ICE-HOUSE AND REFRIGERATOR.—

Directions and Dimensions for construction, with oneillustration of cold house for preserving fruit fromseason to season. The air is kept dry and pure throughoutthe year at a temperature of 34° to 36°. Containedin Scientific American Supplement, 116. Price10 cents. To be had at this office and of all newsdealers.


BEECHER & PECK,

Successors of Milo Peck, Manufacturers of
PECK'S PATENT DROP PRESS.

Regular sizes. Hammerfrom 50 to 2,570 Lb. Specialattention given to makingof Drop Dies, Drop and MachineForgings.

New Haven, Conn.


17-STOP ORGANS

Sub-bass and Oct. Coupler, box'd and ship'd only $97.75.New Pianos, $195 to $1,600. Before you buy aninstrument be sure to see my Mid-summer offer, illustrated,free. Address Daniel F. Beatty, Washington, N. J.

EMERY WHEELS and GRINDING MACHINES.