TERMS.

OUR TERMS are CASH ON DELIVERY, except by special agreement.

Orders from parties not known to us must be accompanied by an advance of at least half the price, or satisfactory City reference.

Goods sent by Express will be C. O. D. Where plates are small they may be sent by Mail upon receipt of price and postage. Remittances must be by draft on New-York or P. O. money order, payable to the order of Photo-Engraving Co., or by registered letter—not by Checks on Local Banks.

We pledge ourselves to meet the reasonable demands of those who employ us. If, in any case, we cannot do so, we will refund the money advanced.

Send Stamp for Illustrated Circular.

THE UNION IRON MILLS, Pittsburgh, Pa., Manufacturers of improved wrought iron Beams and Girders (patented). The great fall which has taken place in the prices of Iron, and especially in Beams used in the construction of FIRE PROOF BUILDINGS, induces us to call the special attention of Engineers, Architects, and Builders to the undoubted advantages of now erecting Fire Proof structures; and by reference to pages 52 & 54 of our Book of Sections—which will be sent on application to those contemplating the erection of fire proof buildings—THE COST CAN BE ACCURATELY CALCULATED, the cost of Insurance avoided, and the serious losses and interruption to business caused by fire; these and like considerations fully justify any additional first cost. It is believed, that were owners fully aware of the small difference which now exists between the use of Wood and Iron, that in many cases the latter would be adopted. We shall be pleased to furnish estimates for all the Beams complete, for any specific structure, so that the difference in cost may at once be ascertained. Address CARNEGIE, BROS. & CO., Pittsburgh, Pa. $5 to $20 per day at home. Samples worth $5 free.
STINSON & CO., Portland, Me.
LIGHT
GRAY IRON		CASTINGSto order promptly.
Plain, Bronzed,
or Galvanized.

We make a specialty of light work.
LIVINGSTON & CO., Iron Founders, Pittsburgh, Pa.

The George Place Machinery Agency Machinery of Every Description. 121 Chambers and 103 Reade Streets, New York. SPARE THE CROTON AND SAVE THE COST. Driven or Tube Wells furnished to large consumers of Croton and Ridgewood Water. WM. D. ANDREWS & BRO., 414 Water St., N. Y. who control the patent for Green's American Driven Well. PATENT RIGHTS for Useful Inventions Wanted. Address Box 1012, P.O., N. Y., with description and terms. TO ELECTRO-PLATERS. JEWELERS, AND WATCHMAKERS. BATTERIES, CHEMICALS, AND MATERIALS, in sets or single, with Books of instruction for Nickel, Gold, and Silver Plating. THOMAS HALL, Manufacturing Electrician, 19 Bromfield Street, Boston, Mass. Illustrated Catalogue sent free. Lathes, Planers, Shapers, Drills, Gear & Bolt Cutters, &c. E. GOULD, Newark, N. J. SELF-ACTING SASH-LOCK
for Meeting Rails

Burglar
Proof. Can not be forced or tampered with in any way. Beautiful design; practical; simple. United States, State, or County Rights for sale. Address
D. C. GOODRICH, Harrisburg, Pa.
THE TRADE ENGINE Noiseless in operation—Perfect in workmanship—all light parts of Cast Steel. Every Engine indicated, and valve corrected to give the highest attainable results. Warranted superior to any semi-portable Engine in the market! Send for Price List and Circular. HERRMANN & HERCHEL—
RODE M'F'G Co.,
Dayton, Ohio, WESSELL METAL, A PERFECT IMITATION of gold in color, surface, etc., for manufacturers of imitation jewelry, and other workers in fine yellow metal. Wessell Manuf'g Co., No. 204 East 23d St., N. Y. Y OU ask WHY we can sell First-Class 7 1-3 Octave Rosewood Pianos for $290. Our answer is, that it costs less than $300 to make any $600 Piano sold through Agents, all of whom make 100 per ct. profit. We have no Agents, but sell Direct to Families at Factory price, and warrant five years. We send our Pianos everywhere for trial and require no payment unless they are found satisfactory. Send for our Illustrated Circular, which gives full particulars, and contains the names of over 1500 Bankers, Merchants and Families that are using our Pianos in every State of the Union. Please state where you saw this notice. Address, U. S. PIANO CO., 810 Broadway, N. Y. $12 a day at home. Agents wanted. Outfit and terms free.
TRUE & CO., Augusta, Maine. Wood-Working Machinery, Such as Woodworth Planing, Tongueing, and Grooving Machines, Daniel's Planers, Richardson's Patent Improved Tenon Machines, Mortising, Moulding, and Re-Saw Machines, and Wood-Working Machinery generally. Manufactured by WITHERBY, RUGG & RICHARDSON,
26 Salisbury Street, Worcester, Mass, (Shop formerly occupied by R. BALL & CO.) N. Y. STENCIL WORKS, 87 Nassau St., N. Y. WANTED — FOR MONCLOVA, STATE of Coahuila, Mexico, a man who knows how to make Star Candles, without the use of Sulphuric Acid, capable to put up and put in running order the necessary apparatus, superintend the manufacturing process, and teach same to the parties interested. Apply and state terms to GOLDFRANK, FRANK & CO.,
San Antonio, Texas.
SELF-ACTING SASH-LOCK
for Meeting Rails

Burglar
Proof. Can not be forced or tampered with in any way. Beautiful design; practical; simple. United States, State, or County Rights for sale. Address
D. C. GOODRICH, Harrisburg, Pa.
Want SALESMEN on a regular salary of
a month and expenses to sell our

to DEALERS. Samples FREE.
Send 3c. stamp to insure answer.
S. FOSTER & CO. Cincinnati, O.


EXTRAORDINARY,

WONDERFUL,

AND VALUABLE

MEDICAL WORK.

With engravings; price, $1.Contains, also, fifty originalprescriptions for prevailingdiseases, each worth tentimes the price of the book.Gold Medal has been awardedthe author. Descriptivecirculars sent free. AddressDr. W. H. PARKER, No.4 Bulfinch Street, Boston.


$100.00 REWARD. This MOUSTACHE or
HEAVY BEARD produced on asmooth face by the use of DYKES BEARD ELIXIR,without injury, or will forfeit $100.00. Price by mailin sealed package 25 cents, 3 packages only 50 cents.

A. L. SMITH & Co., Palatine, Ill., Sole Agents.

We caution the public against imitations.

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.,

NEW YORK.

IMPORTANT FOR ALL CORPORATIONS ANDMANF'G CONCERNS.—Buerk's Watchman'sTime Detector, capable of accurately controllingthe motion of a watchman or patrolman at thedifferent stations of his beat. Send for circular.

J. E. Buerk, P.O. BOX 979, Boston, Mass

N. B.—The suit against Imhaeuser & Co., of New York,was decided in my favor, June 10, 1874. Proceedingshave been commenced against Imhaeuser & Co. for selling,contrary to the order of the Court. Persons usingclocks infringing on my patent, will be dealt withaccording to law.

25 per cent. Discount on Price List of

Superior Wood-Working Machinery

allowed for the present. Alsofor Smith's Chilled-BeamVises; effective, heavy, strong,durable, and economical. Forfull particulars, address

H. B. SMITH,
Smithville, Burlington Co.,

N. J., U. S. A.

HINTS TO YOUNG MACHINE-TENDERS.

By an old Papermaker. Practical Instructionsfor the tending and care of Papermaking Machinery.Showing how to clean a Dandy; how to make goodedges; to keep paper from crushing and worming; tostop crimping; together with many other valuable directions,hints, and suggestions, contained in ScientificAmerican Supplement No. 79. Price 10 cents.To be had at this office and of all newsdealers.

JOHN HOLLAND'S

GOLD PENS

Received the Centennial Medal from the Judges on Awards, for"superior elasticity and general excellence." If not sold by yourStationer, send for Illustrated Price-List to the

Manufactory, 19 W. 4th St., Cincinnati.

SECOND-HAND MACHINERY.

For Sale.

The Machinery in the works of the UTICA STEAMENGINE CO., comprising Large Face Plate Lathe,Engine Lathes, large and small, 20 ft. × 4 ft. Planer,Slotter, Shaper, Lauback Universal Drills, Bolt Cutter,Fans, Upright Drills, Cranes, Dudgeon Steam Hammer,Steam Fire Pump, Hose, Platform Scales, Pulleys, one40 H. P. Locomotive Boiler, two 50 H. P., and one 25H. P. Tubular Boilers, one 36 in. by 16 ft. CylinderBoiler, etc., etc.

For Catalogue and Price List, address

JAMES F. MANN, UTICA, N. Y.

Can be used with any ordinary Kerosene Lamp. Every family wantsone. Price 35 Cts.; by mail 45 Cts. One agentmade $21 in 3 days. Send for terms.

Abott M'f'g Co.,101 Beekman Street, New York.

Iron Castings

to order, smooth and exact to pattern, of Soft Tough Iron,at T. Shriver & Co.'s Foundry, 333 East 56th St., N. Y.Prices very low. Favorable terms made on Castings inregular supply.

Cotton Mills and Machine Shops

Can make great savings by using the Allen Governor.Its operation is unequalled and wonderful. Nearly allmachinists once using these Governors become agentsfor their sale. They are simple in construction, notliable to get out of order, permit the speed of the engineto be changed at will, are neat in appearance, noiseless,very durable, save the engineer's time, save fuel, andare at once the most powerful and most sensitiveGovernors ever made.

Russell (Cotton) Mills, Plymouth, Mass., March 20, 1876.

S. B. ALLEN: Your Governor has been attached to ourCorliss engine over one year, and has given perfect satisfaction.The engine was never governed until yourswas attached, although we have tried three of the bestkind of Governors known. When steam or work varied,the speed would vary, and we could only run our loomsan average of 103 picks per minute. Since using yourGovernor, and solely on account of the perfect steadinesswith which it holds the engine and machinery, weare enabled to run the looms regularly 112 picks per minute,MAKING AN ACTUAL INCREASE OF OUR ENTIREPRODUCTION OF OVER EIGHT PER CENT. Your Governorsaves coal, saves waste, saves care and labor ofthe engineer, and produces more goods and better goods.I have timed the engine a hundred times, and neverfound it to vary in the least. It is the honest truth thatthe Allen Governor holds it exactly on speed.

Address

L. C. KING, Superintendent.

GERARD B. ALLEN & CO., St. Louis.
FRASER & CHALMERS, Chicago.
NEW ORLEANS MACHINERY DEPOT, New Orleans.
PACIFIC IRON WORKS, San Francisco.
FILER, STOWELL & CO., Milwaukee, Wis., or
THE ALLEN GOVERNOR CO., Boston.

HORSE STALL FLOOR,

Patented through the Scientific American PatentAgency, June 4th, 1872. Rights sent by mail, with fullinstructions how to make and use, on receipt of $1.00; twofor $1.50. It will keep the stall cleaner and the horsemuch more comfortable than any floor in use. It requiresless than one-half of the usual amount of bedding. Anyman can make them with very little expense. A liberaldiscount to carpenters or stable keepers in quantities oftwelve or more. This floor is used throughout the NewEngland States, and many parts of the South and West.State, County, and Town rights for sale. Agents wanted.

G. W. GORDON,

256 Broadway, Chelsea, Mass.

THE BIGELOW

Steam Engine.

BOTH PORTABLE AND STATIONARY.

The CHEAPEST AND BEST in the market.
Send for descriptive circular and price list.

H. B. BIGELOW & CO.,

New Haven, Conn.

LeCOUNT'S PATENT

Machinists' Tools.

REDUCED PRICES.
Set Iron Dogs,3-8 to 2 in.,$5.60
" " "3-8 to 4 in.,12.00
" Steel "3-8 to 2 in.,6.30
" " "3-8 to 4 in.,13.00

Iron & Steel Clamps, Die Dogs, Clamp Dogs, Vice Clamps,
Expanding Mandrels, &c. Send for latest Price List to
C. W. LE COUNT, South Norwalk, Conn.

Working Models

And Experimental Machinery, Metal or Wood, made toorder by

J. F. WERNER, 62 Center St., N. Y.

CAVEATS, COPYRIGHTS, TRADEMARKS, 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,Trade Mark Regulations, 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, TheScientific American Hand Book, an elegantly illustratedpamphlet of 48 pages, containing further informationabout Patents and how to procure them; directionsconcerning Trade Marks, Copyrights, Designs,Patents, Appeals, Reissues, Infringements, Assignments,Rejected Cases, Hints on the Sale ofPatents.

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. Address

MUNN & CO., 37 Park Row, New York city.

Pyrometers, For showing heat ofOvens, Hot Blast Pipes,Boiler Flues, Super-Heated Steam, Oil Stills, &c.

HENRY W. BULKLEY. Sole Manufacturer,

149 Broadway, New York.

$5 Outfit free. Salary guaranteed. Write at once to
EMPIRE NOVELTY CO., 309 Broadway, New York.

TAYLOR'S M'F'G CO., WESTMINSTER, MD., Portable
and Stationary Engine Builders, etc. Send for Cata.


Wright's Pat. Bucket
Plungers are the best.

VALLEY MACHINE Co.
Easthampton, Mass.

ROOTS' FORCE BLAST BLOWER,

FIRST PREMIUM

AWARDED

AT

PARIS AND VIENNA,

SPEED ONLY 100 TO ??0 REV. PER M. SAVES

HALF THE POWER REQUIRED FOR FAN.

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

S. S. TOWNSEND, Gen'l' Ag't, 6 Cortlandt St., NEW YORK.

Established 1844.

JOSEPH C. TODD,

(Formerly of Todd & Rafferty), ENGINEER and MACHINIST.Flax, Hemp, Jute, Rope, Oakum, and BaggingMachinery, Steam Engines, Boilers, etc. Also Agent forthe celebrated and improved Rawson & Rittinger HoistingEngine, I will furnish specifications and estimates forall kinds of machinery. Send for descriptive circularand price. Address

J. C. TODD,
10 Barclay St., New York, or Paterson, N. J.

GUILD & GARRISON,

34 to 44 First St.,

Williamsburgh, N. Y.,
Manufacturers of
STEAM PUMPS
for all purposes.

Also Vacuum Pumps,
Vacuum Fans and
Air Compressors.


NON-COMBUSTIBLE STEAM BOILER AND PIPE

WITH "AIR SPACE" IMPROVEMENT.

Saves 10 to 20 per cent. CHALMERS SPENCE CO.,

Foot E. 9th St. N. Y.; 1202 N. 2d St., St. Louis, Mo.

NEW WOOD LATHE; ALSO SCROLL SAW. BOTH
new and first-class. Send for circulars.

H. BICKFORD, Cincinnati, O.


ROCK DRILLING MACHINES
AND
AIR COMPRESSORS.
MANUFACTURED BY
Burleigh Rock Drill Co.
SEND FOR PAMPHLET. FITCHBURG MASS.

MACHINISTS' TOOLS.

NEW AND IMPROVED PATTERNS.

Send for new illustrated catalogue.

Lathes, Planers, Drills, &c.

NEW HAVEN MANUFACTURING CO.,

New Haven, Conn.

Steel Castings,

From ¼ to 10,000 lbs. weight, true to pattern. An invaluablesubstitute for forgings, or for malleable iron castingsrequiring great strength. Send for circular andprice list to
CHESTER STEEL CASTING COMPANY,
EVELINA STREET, PHILADELPHIA, PA.



FULL SIZE PLANER SAW TOOTH - 3 CENTS EACH


"OFFICE OF DICKINSON BROS., RIDGEWAY, ELK Co., PA., May 28th, 1877.


"Messrs. EMERSON, SMITH & Co. GENTS: We have been through four wintersin frozen hemlock, cutting 20,000 feetof lumber per day with your Patent Planer Saw, averaging 75,000 feet with each set of 40 bits."

Mill Men and Sawyers, send your full address, plainly written, on a postal card,for Emerson's Hand Book of Saws, free,to EMERSON, SMITH & CO., Beaver Falls, Pa. Please name size and style of saw used.

Machines

AND

Wheels

Guaranteed.

Send for

Illustrated

Circular,

Weissport,

PA.

PERFECT

NEWSPAPER FILE

The Koch Patent File, for preserving newspapers,magazines, and pamphlets, has been recently improvedand price reduced. Subscribers to the Scientific Americanand Scientific American Supplement can besupplied for the low price of $1.50 by mail, or $1.25 at theoffice of this paper. Heavy board sides; inscription"SCIENTIFIC AMERICAN," in gilt. Necessary forevery one who wishes to preserve the paper.

Address

MUNN & CO.,

Publishers Scientific American.

HARTFORD

STEAM BOILER

Inspection & Insurance

COMPANY.

W. B. FRANKLIN, V. Pres't. J. M. ALLEN, Pres't.


J. B. PIERCE, Sec'y.

PUNCHING
PRESSES.Drop Hammers and Dies, for working Metals, &c.
THE STILES & PARKER PRESS CO.,
Middletown, Conn.


A PRACTICAL MACHINIST, WITH TEN

years' experience as Foreman in one of the largest andmost successful shops in the country, employing overfour hundred men, wishes employment. Would bewilling to invest a few thousand dollars in a safe andpaying business. Address A. Foreman, P. O., Phila., Pa.

WANTED:

Agents for the Automatic Gas Lighting Torch in every gas-burning town in the United States. Exclusive territory given. Sewing machine agents preferred. This Torch lights without matches. Address

The Stockwell Self-Lighting Gas Burner Co.,
89 LIBERTY STREET, NEW YORK.


GUARDIOLA'S COFFEE & SUGAR MACHINERY Coffee, Malt, Corn, Cocoa, and Grain-drying Machine. Coffee-Hulling and Polishing Machines. Coffee-Washing Machine. Helix Sugar Evaporator. Messrs. C. ADOLPHE LOW & CO., 42 Cedar Street, Messrs. MUNOZ & ESPRIELLA, 52 Pine Street, New York, are Mr. Guardiola's Agents, and they will give prompt attention to all orders for any of the above machines. THE HOADLEY
PORTABLE STEAM ENGINE.
WITH AUTOMATICAL CUT-OFF REGULATOR AND BALANCED VALVE.
THE BEST AND MOST ECONOMICAL ENGINE MADE
SEND FOR CIRCULAR.
The J. C. HOADLEY CO. LAWRENCE, MASS.
STATE WHERE YOU SAW THIS. EAGLE FOOT LATHES, Improvement in style. Reduction in prices April 20th. Small Engine Lathes. Slide Rests, Tools, etc. Also Scroll and Circular Saw Attachments, Hand Planers, etc. Send for Catalogue of outfits for Amateurs or Artisans. WM. L. CHASE & CO.,
95 & 97 Liberty St., New York. Mill Stones and Corn Mills. We make Burr Millstones, Portable Mills, Smut Machines, Packers, Mill Picks, Water Wheels, Pulleys, and Gearing, specially adapted to Flour Mills. Send for catalogue. J.T. NOYE & SON, Buffalo, N. Y. F. ADEE & CO.'S PATENT LEAD STENCH TRAPS. Positive protection against Sewer-gas. Best and cheapest. See illustration, Scientific American, April 14th. Send for circular. F. ADEE, 275 Pearl St., N. Y. ASBESTOS BOARD, For Flange Joints, Cylinder Heads, Man-hole Plates, etc.
The only genuine, strictly fire-proof, made from pure Italian Asbestos. All sizes, from 1-32 to 1-4 inch. H. W. JOHNS M'F'G CO., 87 Maiden Lane, New York. THE TANITE CO., STROUDSBURG, PA. EMERY WHEELS AND GRINDERS. GEO. PLACE, 121 Chambers St., New York Agent. $3 PRINTING PRESS! Prints cards, envelopes, etc., equal to any press. Larger sizes for large work. Do your own printing and advertising and save money. Excellent spare hour amusement for old or young. Or it can be made money making business anywhere. Send 3c. stamps for large catalogue to KELSEY & CO., Manufacturers,
Meriden, Conn.
THE HOADLEY
PORTABLE STEAM ENGINE.
WITH AUTOMATICAL CUT-OFF REGULATOR AND BALANCED VALVE.
THE BEST AND MOST ECONOMICAL ENGINE MADE
SEND FOR CIRCULAR.
The J. C. HOADLEY CO. LAWRENCE, MASS.
STATE WHERE YOU SAW THIS.

NOTICE TO

FOREIGN SUBSCRIBERS.

For the convenience of subscribers residing abroad, we have prepared the annexed table, exhibiting the subscription price of the Scientific American and Supplement in the principal foreign currencies:


The prices here given arefor one year's subscription,including the postage.
AustriaS. Florins91320
BelgiumFrancs203046
DenmarkKroner152335
FranceFrancs203046
German EmpireR. M.162537
Great BritainShillings162436
HollandH. F.91421
ItalyFrancs203046
NorwayKroner152335
RussiaRoubles5811
SwedenKroner152335
SwitzerlandFrancs203046

Deposit either of the above amounts in any of the important post offices in Great Britain or Ireland, or in any country on the Continent of Europe, making the order payable to MUNN & Co., New York city, and send us the receipt, with the name of the sender, and the address to which the paper is to be mailed.

Tube Cleaners for cleaning BoilerTubes.
THE NATIONAL STEEL TUBE

CLEANER CO. 814 E. 9th St., N. Y.

ALCOTT LATHES, for Broom, Rake and Hoe Handles.

S. C. HILLS, 78 Chambers St. N. Y.

DROP FORGINGS and
SPECIAL MACHINERY,
THE HULL & BELDEN CO.,

Danbury, Conn.

DAMPER
REGULATORS		BEST
AND LEVERS
GAUGE COCKS.

MURRILL & KEIZER, 44 HOLLIDAY ST., BALTIMORE

TORPEDO VESSELS. By Mr. DONALDSON.

A valuable paper, lately read before the UnitedService Institute. Being a full exposition of the Torpedo-boatsystem, from the earliest efforts to the presenttime. Giving dimensions and performances of theseveral sizes built by Thornycroft Bros. for the variousgovernments, highly interesting trials of these boats,and experiences in war, and a description of the torpedoesused. 1 illustration. Contained in ScientificAmerican Supplement No. 79. Price 10 cents. Tobe had at this office and of all newsdealers.

BOGARDUS' PATENT UNIVERSAL ECCENTRIC MILLS—For grinding Bones, Ores, Sand, OldCrucibles, Fire Clay, Guanos, Oil Cake, Feed, Corn,Corn and Cob, Tobacco, Snuff, Sugar, Salts, Roots,Spices, Coffee, Cocoanut, Flaxseed, Asbestos, Mica,etc., and whatever cannot be ground by other mills.Also for Paints, Printers' Inks, Paste Blacking, etc.JOHN W. THOMSON, successor to JAMES BOGARDUS,corner of White and Elm Sts., New York.

LEHIGH UNIVERSITY.—Tuition Free.

Civil, Mechanical, and Mining Engineering; Chemistryand Metallurgy; Full Classical Instruction; French andGerman; English Literature; International and ConstitutionalLaw; Psychology and Christian Evidences.

For Registers, address the Rev. JOHN M. LEAVITT,D.D., President, Bethlehem, Penna.

DRILLS,Jigging Machines, etc.
Illustrated catalogues sent
FREE

Address AMES M'F'G CO., Chicopee, Mass.

PHOSPHOR-BRONZE AND ITS APPLICATIONS.By ALEXANDER DICK. A series of valuabletests, showing the superiority of Phosphor-bronzeover ordinary bronze. Old bronze and new compared.Phosphor-bronze under oft-repeated strains; also itsadaptability to frictional purposes. Contained in ScientificAmerican Supplement No. 79. Price 10 cents.To be had at this office and of all newsdealers.

Paints, Roofing, Steam Pipe and Boiler Coverings,Steam Packing, Sheathings, Fire, Acid, andWaterproof Coatings, Cements, etc. Send for Samples, IllustratedCatalogues, Price Lists, etc.

87 MAIDEN LANE, NEW YORK.

FIFTY SYRUP RECIPES, FOR HOUSEHOLDpurposes, Mineral Waters, etc., to wit: SimpleSyrup, (2) Lemon Syrup, Mulberry Syrup, Vanilla Syrup,Vanilla Cream Syrup, (2) Cream Syrup, Ginger Syrup,Orange Syrup, (2) Pineapple Syrup, Nectar Syrup, SherbetSyrup, Grape Syrup, Banana Syrup, (2) Coffee Syrup,Wild Cherry Syrup, Wintergreen Syrup, (2) SarsaparillaSyrup, Maple Syrup, (2) Chocolate Syrup, Coffee CreamSyrup, Ambrosia Syrup, Hock and Claret Syrup, SolferinoSyrup, Capsicum Syrup, Cherry Syrup, StrawberrySyrup, (2) Raspberry Syrup, Peach Syrup, BlackberrySyrup, Orgeat Syrup, Catawba Syrup, Milk Punch Syrup,Champagne Syrup, Sherry Cobbler Syrup, ExcelsiorSyrup, Fancy Syrup, Currant Syrup, Framboise Syrup,Maidenhair Syrup, Orange Flower Syrup, CinnamonSyrup. How to make Syrups Frothy.

Colognes for the Sick Room, by GEO. LEIS. Withrecipes for the production of preparations that serve aspleasing perfumes, deodorizers, and cosmetic lotions.All the above are contained in Scientific AmericanSupplement No. 77. Price 10 cents. To be had at thisoffice and of all newsdealers.

THE "Scientific American" is printed with CHAS.ENEU JOHNSON & CO.'S INK. Tenth and LombardSts., Philadelphia, and 59 Gold St., New York.

Transcriber's Note: Some archaic (Early American) spellings have been retained. Obvious punctuation errors have been repaired. Errata The remaining corrections made are indicated by dotted lines under the corrections.
Scroll the mouse over the word and the original text will appear. 'thin' corrected to 'tin'
"... the requisite quantity depending upon the thickness of the tin plate to be removed."
[Article 13] 'put' corrected to 'but'
"... but plenty of good soap and warm water,..."
[Article NQ (39)] P. 16: "SPEED ONLY 100 TO ??0 REV. PER M. SAVES HALF THE POWER REQUIRED FOR FAN." figure obscured by address label ('Journal of Pharmacy X 145 S 10th st.').
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