Scientific American, Volume 22, No. 1, January 1, 1870 / A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.
Contents: (Illustrated articles are marked with an asterisk.)
In our description of these boats in No. 25, Vol. XXI., special mention was made of the compactness of the engines.
It has frequently been urged as an objection against the twin screw system that the double set of engines, four steam cylinders with duplicates of all the working parts called for on this system, render the whole too complicated and heavy for small vessels, preventing, at the same time, the application of surface condensation. In the engines of the Spanish gunboats, of which we annex an illustration from Engineering , the designer, Captain Ericsson, has overcome these objections by introducing a surface condenser, which, while it performs the function of condensing the steam to be returned to the boiler in the form of fresh water, serves as the principal support of the engines, dispensing entirely with the usual framework. Besides this expedient, each pair of cylinders have their slide frames for guiding the movements of the piston rods cast in one piece. Altogether the combination, is such that the total weight and space occupied by these novel twin screw engines do not exceed the ordinary single screw engines of equal power. Several improvements connected with the working gear have been introduced.
ENGINES OF THE TWIN SCREW SPANISH GUNBOATS
The outer bearings of the propeller shafts, always difficult to regulate and keep in order on the twin screw system, are selfadjusting and accommodate themselves to every change of the direction of the shafts. This is effected by their being spherical externally, and resting in corresponding cavities in the stern braces or hangers. The spring bearings for supporting the middle of the shafts are also arranged on a similar self-adjusting principle.
The thrust bearing is of peculiar construction, the arrangement being such that the bearing surfaces remain in perfect contact however much the shaft may be out of line. The reversing gear likewise is quite peculiar, insuring complete control over the movement of the two propellers under all circumstances. It is claimed that these engines are the lightest and most compact yet constructed for twin screw vessels.
Various
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SCIENTIFIC AMERICAN
Engines of the Spanish Gunboats.
The Torpedo Boat Problem.
SUGAR MAKING IN LOUISIANA.
Sticking, or Court Plaster.
AN IMPROVED HOISTING PULLEY WANTED.
FERDINAND DE LESSEPS--CHIEF PROMOTER OF THE SUEZ CANAL.
[From the Phrenological Journal.]
AN INGENIOUS VENT PEG.
A New English Patent Pulley Block.
Plants In Sleeping Rooms.
Improved Treadle Motion.
Improved Method of Catching Curculios.
Remains of a Megatherium in Ohio.
Artificial Ivory.
AMERICAN AND ENGLISH RAILWAY PRACTICE CONTRASTED.
BOILER COVERING.
Attachment of Saws to Swing-Frames.
PATENT DECISION.
Inventions Patented In England by Americans.
Russ' Improved Wood Molding Machine.
A Lost Civilization.
GIRARD'S "PALIER GLISSANT."
SCIENTIFIC AMERICAN
A HAPPY NEW YEAR!
THE SUEZ CANAL NOT YET A FAILURE.
TUBULAR BOILERS AND BOILER EXPLOSIONS.
AMERICAN RAILWAY MANAGEMENT.
THE AMERICAN INSTITUTE PRIZES AWARDED TO STEAM ENGINES.
A PROTEST AGAINST THE CANADIAN PATENT LAW.
THE BRIGHTER SIDE.
PROFESSOR FISKE'S LECTURES AT HARVARD.
SCIENTIFIC LECTURES BEFORE THE AMERICAN INSTITUTE.
THE BATTLE FIELDS OF SCIENCE.
LECTURE BY PROFESSOR WHITE, BEFORE THE AMERICAN INSTITUTE.
HOW FRENCH BANK NOTES ARE MADE.
WHAT THE NEWSPAPERS SAY.
CHINESE METHODS OF PRESERVING EGGS.
STEAM BOILER INSPECTION.
EDITORIAL SUMMARY.
THE STEVENS BREECH-LOADING RIFLE.
A NOVEL FRENCH HAND VISE.
THE MOUND-BUILDERS IN COLORADO.
THE WOVEN-WIRE MATTRESS.
Flouring Mill Hazards.
Fire-Proof Buildings.
The Decline of American Shipping.
CORRESPONDENCE.
Aerial Navigation--A Suggestion.
Puttying Floors of Jewelers Shops and Otherwise.
Western Demand for Agricultural Implements.
Economical Steam Engine.
Friction and Percussion.
Oiling a Preservative of Brown Stone.
Interesting Correspondence from China.
Communication Between Deaf and Blind Mutes.
Cheap Cotton Press Wanted.
A Singular Freak of a Magnet.
PRESERVATION OF IRON.
THE BANANAS AND PLANTAINS OF THE TROPICS.
[For the Scientific American.]
PUTTING UP STOVES.
THE MAGIC LANTERN.
The Largest Well in the World--Capacity 1,000,000 Gallons of Water per Day.
PAPER FOR BUILDING.
Improved Muzzle-Pivoting Gun.
Stock Feeding by Clock Work.
Milk, and What Comes of It.
Improved Hay Elevator.
IMPROVEMENT IN LAMP WICKS.
Great Transformation.
Moore's Rural New Yorker
BUSINESS AND PERSONAL.
ANSWERS TO CORRESPONDENTS.
RECENT AMERICAN AND FOREIGN PATENTS.
NEW BOOKS AND PUBLICATIONS.
Information about Caveats, Extensions, Interferences Designs, Trade Marks; also, Foreign Patents.
CONSULTATIONS AND OPINIONS FREE.
TO APPLY FOR A PATENT,
PRELIMINARY EXAMINATION
COST OF APPLICATIONS.
REJECTED CASES.
CAVEATS
REISSUES.
DESIGNS, TRADE MARKS, AND COMPOSITIONS
PATENTS CAN BE EXTENDED.
INTERFERENCES
FOREIGN PATENTS.
Official List of Patents.
REISSUES.
DESIGNS.
EXTENSIONS.
PATENTS ISSUED FOR THE WEEK ENDING DEC. 21, 1869.
REISSUES.
DESIGNS.
This Illustrated Weekly Journal of Practical Information, Art, Science, Mechanics, Invention, Chemistry, and Manufactures--Entered its Twenty-fifth Year on the 1st of January.
SCHEDULE OF CASH PRIZES.