pamphlets, has been recently improved and price reduced. Subscribers
to the SCIENTIFIC AMERICAN and SCIENTIFIC AMERICAN SUPPLEMENT can be
supplied for the low price of $1.50 by mail, or $1.25 at the office of
this paper. Heavy board sides; inscription "SCIENTIFIC AMERICAN,"
in gilt. Necessary for every one who wishes to preserve the paper.
Address
MUNN & CO.,
Publishers SCIENTIFIC AMERICAN.
[Illustration:
HOWE SCALE CO.,
Rutland, Vt.
Paris 1878
Were awarded the
GOLD MEDAL]
The highest award for Scales; also several Special Medals of Gold,
Silver, and Bronze. In addition to the above the
HOWE SCALE CO.
have been awarded the _"First Premium"_ at Twelve different State
Fairs held during the Fall of the present year.
PRINCIPAL AGENCIES:
PRIEST, PAGE & CO., 325 Broadway, New York.
PRIEST, PAGE & CO., 145 Franklin St., Boston.
A. M. GILBERT & CO., 97 to 101 Lake St., Chicago.
J. FRED DENNIS, European Manager, Bremen, Germany.
[Illustration]
THE COLUMBIA BICYCLE,
Made by THE POPE M'F'G CO., 89 Summer Street, Boston.
A practical road machine, easy to learn to ride, and when mastered one
can beat the best horse in a day's run over an ordinary road. Send 3c.
stamp for catalogue.
BIG PAY.--With Stencil Outfits. What costs 4 cts. sells rapidly
for 50 cts. Catalogue _free_. S. M. SPENCER, 112 Wash'n St., Boston,
Mass.
65 MIXED CARDS with name, 10c. and stamp.
Agent's Outfit, 10c. L. C. COE & Co., Bristol, Ct.
[Illustration]
YALE VERTICAL MILL
Iron Frame; French Burr; Self-oiling; Self-feeding; Long Bearings;
Adjustable-balanced; best arranged, made and finished, _cheapest_, and
for quality and quantity ground no superior in the world.
Also the Yale Vertical and Horizontal Steam Engines and Boilers, Send
for Circular.
YALE IRON WORKS, New Haven, Conn.
_WORKING MODELS_
And Experimental Machinery, Metal or Wood, made to order by
J. F. WERNER, 62 Centre St., N. Y.
[Illustration:
H. W. JOHN'S BOILER COVERINGS
ASBESTOS (Trade Mark)]
Are the most Effective and Economical Non-conducting Coverings in the
World. Ready for use and can be easily applied by any one. Be sure and
get the Genuine, which are Manufactured only by
H. W. JOHNS MANUFACTURING CO., 87 Maiden Lane. New York,
Sole Manufacturers of Genuine Asbestos Roofing, Liquid Paints,
Cements, etc. Send for Price Lists, etc.
PYROMETERS,
For showing heat of Ovens, 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.
[Illustration: WIRE ROPE]
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.
[Illustration]
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.
DIAMOND ROCK DRILLS
The only Machines giving a solid core showing exact nature of rocks
passed through.
THE AMERICAN DIAMOND ROCK BORING CO.
NEW YORK.
SEND FOR PAMPHLET.
Every Man His Own Printer!
[Illustration: THE EXCELSIOR]
$3 PRESS Prints labels, cards etc. (Self-inker $5) 9 Larger sizes For
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 for Illustrated Catalogue.
R. & J. BECK, Philadelphia, Pa.
FOR ALL KINDS OF MACHINERY
--Apply to S. C. HILLS, 78 Chambers St., New York.
BEST
DAMPER REGULATORS
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.
ROCK DRILLING MACHINES
AND
AIR COMPRESSORS,
MANUFACTURED BY
BURLEIGH ROCK DRILL Co.
SEND FOR PAMPHLET.
FITCHBURG MASS.
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.
[Illustration:
WATSONS NON CHANGEABLE GAP LATHE HAS
GREAT FACILITIES FOR LARGE OR MEDIUM SIZE WORK
JAMES WATSON MANR 1608 S. FRONT ST. PHILA. PA.]
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.
* * * * *
THE "Scientific American" is printed with CHAS. ENEU JOHNSON & CO.'S
INK. Tenth and Lombard Sts., Philadelphia, and 59 Gold St., New York.
* * * * *
Transcriber's Note:
_x_ indicates italic script; =x= indicates bold script. ^ indicates
superscript.
Some archaic (Early American) spellings have been retained.
Erata:
'irridescent' corrected to 'iridescent'.
"Glass, iridescent"
(Contents)
'monoply' corrected to 'monopoly'.
"The cry of monopoly in this case is altogether unfounded,..."
(Article 4: Progress of Petroleum)
'possesing' corrected to 'possessing'.
"... possessing in every way the original form of the wood."
(Article 42: Reduction of Nitrate of Silver by Means of Charcoal.)