Pyrometers, For showing heat ofOvens, Hot Blast Pipes,Boiler Flues, Superheated Steam, Oil Stills, etc.

HENRY W. BULKLEY, Sole Manufacturer,

149 Broadway, N. Y.

CAMERON
Steam Pumps

For Mines, Blast Furnaces, Rolling
Mills, Oil Refineries, Boiler
Feeders, &c.

For Illustrated Catalogue and Reduced Price List send to
Works, Foot East 23d St., New York.

Address JOHN A. ROEBLING'S SONS, Manufacturers,Trenton, N. J., or 117 Liberty Street, New York.

Wheels and Rope for conveying power long distances.
Send for circular.

ICE AT $1.00 PER TON.

The PICTET ARTIFICIAL ICE CO.,

LIMITED,

Room 51, Coal and Iron Exchange, P.O. BOX 3083, N. Y.


ROOTS' ROTARY HYDRAULIC ENGINE.

FOR

BLOWING ORGANS

AND RUNNING

LIGHT MACHINERY

OPERATED BY

HYDRANT PRESSURE,

GIVES GREATEST USEFUL EFFECT OF WATER.

IS A POSITIVE PRESSURE ENGINE.

P. H. & F. M. ROOTS, Manuf'rs, CONNERSVILLE, IND.
S. S. TOWNSEND, Gen'l Ag't, 6 Cortlandt St., NEW YORK.

Woodward Steam Pumps and Fire Engines,

G. M. WOODWARD,
76 and 78 Centre Street, New York.

Send for catalogue and price list.

60 Chromo and Perfumed Cards [no 3 alike], Name in
Gold and Jet, 10c. Clinton Bros., Clintonville, Ct.

The only Machines giving a solid core showing exactnature of rocks passed through.

Every Man
His Own
Printer!

$3 PRESS Prints labels,cards etc. (Self-inker $5) 9 Larger sizesFor business, pleasure, young or old.
Catalogue of Presses, Type, Etc.,for 2 stamps.

KELSEY & Co.
Meriden, Conn.


MICROSCOPES, Opera Glasses, Spectacles,at greatly reduced prices. Send three stamps forIllustrated Catalogue.

R. & J. BECK, Philadelphia, Pa.

FOR ALL KINDS OF MACHINERY—Apply to

S. C. HILLS, 78 Chambers St., New York.


DAMPER
REGULATORS
BEST
AND WEIGHTED
GAUGE COCKS.

MURRILL & KEIZER, 44 HOLLIDAY ST., BALTIMORE.

GET THE BEST

PIPE AND BOILER COVERING

ASBESTOS-LINED HAIR FELT.

Lightest covering and best non-conductor. Asbestos lining prevents any charring of the hair felt. Easily applied and removed.

For prices, etc., address THE ASBESTOS PACKING CO., 25 State St., Boston, Mass.

THE TANITE CO., STROUDSBURG, PA. EMERY WHEELS AND GRINDERS. GEO. PLACE, 131 Chambers St., New York Agent. Established 1844. JOSEPH C. TODD, Engineer and Machinist. Flax, Hemp, Jute, Rope, Oakum and Bagging Machinery, Steam Engines, Boilers, etc. I also manufacture Baxter's New Portable Engine of 1877. Can be seen in operation at my store. A one horse-power portable engine, complete, $125; two horse-power, $225; two and a half horse-power, $250; three horse-power, $275. Manufactured exclusively by J. C. TODD, 10 Barclay St., New York, or Paterson, N. J. BAXTER $100 1 HORSE ENGINE OF 1877. For State Rights to manufacture above, apply to A. VAN WINKLE, Newark, N. J. TO ADVERTISERS! We fill orders for the insertion of advertisements in the newspapers of the United States and Dominion of Canada. To furnish advertisers with reliable information concerning newspapers and their rates, and thus enable the most inexperienced to select intelligently the mediums best adapted to any particular purpose, WE ISSUE SEMI-ANNUAL EDITIONS OF AYER & SON'S MANUAL FOR ADVERTISERS. 164 8vo. pp. Gives the names, circulation, and advertising rates of several thousand newspapers in the United States and Canada, and contains more information of value to an advertiser than can be found in any other publication. All lists carefully revised in each edition, and where practicable prices reduced. The special offers are numerous and unusually advantageous. It will pay you to examine it before spending any money in newspaper advertising. The last edition will be sent postpaid to any address on receipt of 25 cents by N. W. AYER & SON, Advertising Agents, Times Building, Philadelphia. Pond's Tools, Engine Lathes, Planers, Drills, &c. DAVID W. POND, Worcester, Mass. Can I Obtain a Patent? This is the first inquiry that naturally occurs to every author or discoverer of a new idea or improvement. The quickest and best way to obtain a satisfactory answer, without expense, is to write to us (Munn & Co.), describing the invention, with a small sketch. All we need is to get the idea. Do not use pale ink. Be brief. Send stamps for postage. We will immediately answer and inform you whether or not your improvement is probably patentable; and if so, give you the necessary instructions for further procedure. Our long experience enables us to decide quickly. For this advice we make no charge. All persons who desire to consult us in regard to obtaining patents are cordially invited to do so. We shall be happy to see them in person at our office, or to advise them by letter. In all cases, they may expect from us a careful consideration of their plans, an honest opinion, and a prompt reply. What Security Have I that my communication to Munn & Co. will be faithfully guarded and remain confidential? Answer.—You have none except our well-known integrity in this respect, based upon a most extensive practice of thirty years' standing. Our clients are numbered by hundreds of thousands. They are to be found in every town and city in the Union. Please to make inquiry about us. Such a thing as the betrayal of a client's interests, when committed to our professional care, never has occurred, and is not likely to occur. All business and communications intrusted to us are kept secret and confidential. Address MUNN & CO.,
Publishers of the Scientific American, 37 Park Row New York. T HE "Scientific American" is printed with CHAS. ENEU JOHNSON & CO.'S INK. Tenth and Lombard Sts., Philadelphia, and 59 Gold St., New York.