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.