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g This is our ninth birthday. g We are eight years old and proud of it. g It is something even to be alive at the end of a period which has seen such frightful infant mortality in the magazine nursery. Scores of bright-eyed young periodicals have grown blue in the type-face and passed away during the last eight years from defective circulation. g To survive at all is proof of a good constitution. g To have grown constantly stronger in influence and in circulation justifies complete confidence in the vitality of the idea on which the Technical World Magazine is founded: g The most interesting thing in the world is the story of man's ceaseless and successful endeavor to harness and tame to his own uses the tremendous forces of Nature. 9 During the eight years which cover our span of life, the inventors, the scientists and engineers — all the gentleman adventurers of the new democracy — have pushed far forward into the realms of the unknown. g The air has been conquered. The skies are full of bird-men. 9 The depths of the ocean have been invaded by submarines which travel a thousand miles under their own power. g The explosive power of gases has been used to send a million men flashing back and forth on their daily errands. g Tremendous steam engines, creaking and snorting, have given way to tiny, silent turbines.

TECHNICAL WORLD MAGAZINE

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g Electricity has been sent through the pathless ether
to explode torpedoes and guide boats on their desired
courses—to carry messages over mountain ranges and
across the ocean.
g Wherever water runs down hill the power of the
“white coal” has been put to turning wheels and
spinning turbines.
g Of cement and sand and water a liquid stone has
been mixed, which hardens overnight into inde-
structible towers and houses and great sky-scrapers.
g Men speak with each other through the vacant air
across miles of space.
g Invisible power is carried hundreds of miles over
country on small wires and delivered instantly at a
thousand scattered points.
g The microscopic germs which are man's most re-
lentless enemy have been brought under man's control.
I The farmer has been taught how to master the
seasons and force the earth to yield its increase.
a To-day the world trembles on the verge of dis-
coveries which may double the field of knowledge and
the capacity of the human race.
g People who read the Technical World Magazine
regularly keep abreast of the van of progress.
g They find in it every month the latest news bulletins
from the battle front.
g And more than fifty per cent of them renew their
subscriptions year after year.
g Is there any other magazine anywhere which can
truthfully make the same statement?

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place the aeronaut guiding an aeroplane has too much to do and too much attention to pay to different things to burden himself with an apparatus requiring considerable room and, attention. In the second place a parachute is of great value when the aeronaut knows at what time he wants to detach himself from his ma

chine, but of very little value in the case NEW SAFEGUARD FOR THE AVIATOR.

of a sudden and unexpected fall. A

young Berlin engineer has invented a PARACHUTE FOR

cloak which seems to answer all requireAEROPLANISTS

ments. It can be worn like a cape, is not

heavier than an ordinary overcoat, and THE necessity for a safety device to does not impede the movements of the

protect aeronauts in case of accidents wearer. As soon as the aeronaut begins to their machines is universally recog to drop, it opens automatically, and is nized. The ordinary parachutes used strong enough to break the descent so by professional balloonists will

not that the wearer glides down easily, and answer the purpose because in the first all danger of a sudden fall is obviated.

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NOVEL FORM OF AEROPLANE, This machine is the invention of an Englishman and has a sort of turbine in the head instead of a regular propeller.

Next Month's Features-See Next Page

Technical World Magazine

HENRY M. HYDE, Editor

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Contents for April, 1912 The Brotherhood of Bread

Judson C. Welliver 124 Two Hundred Cities in Revolt

Henry M. Hyde 137 When Welsh and Irish Rule

Robert Barr 147 Electricity Makes Flowers Bloom

Edward I. Pratt 155 Fortunes Wasted in a Paying Industry Guy E. Mitchell 158 A Folding Bungalow .

Robert H. Moulton 161 New Fruits to Lower Cost of Living

Charlton Lawrence Edholm 165 Foreign Autos of Low Cost

F. M. Bradley 171 Fish-Canning Plant on Shipboard .

John H. Cobb 174 Woman Civil Engineer

Richard Morrison 176 New Sheep for the West.

Arthur Chapman 178 Canadium-More Precious Than Gold

Dr. Leonard K. Hirshberg 182 Natural Easter Eggs

F. G. Moorhead 184 Problem of Bug Travel

René Bache 188 Electric Cars Without Motormen .

F. M. Lester 203 Popular Science and Mechanics Supplement

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Technical World Magazine should be on the news-stands on the 17th of the month preceding the date of issue. Patrons unable to get the magazine on the 17th will

confer a favor by notifying the Circulation Manager. News-stand patrons should instruct their News-dealer to reserve their copy of Technical World, otherwise they are likely to find the magazine sold out".

TERMS: $1.50 a year; 75 cents for six months: 15 cents a copy. Foreign postage, $1.00 additional; Canadian postage, 50 cents additional. Notice of change of address should be given thirty days in advance to avoid missing a number.

TECHNICAL WORLD COMPANY 58th St. and Drexel Avenue, Chicago

1702 Flatiron Building. New York

Estered at the Postoffice, Chicago, III., as second-class mail matter.

MAGAZINE FOR MAY

WHAT STEEL DIVIDENDS COST

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HENRY M. HYDE The firm of J. Pierpont Morgan got $70,000,000 for organizing the Steel Trust. On this and the rest of its stock-watered and otherwise, the Steel Trust has made in ten years a billion dollars in profits. And 23,000 men employed by the Steel Trust work twelve hours a day and seven days a week-except once in two weeks, when they work twenty-four hours out of one day when the gangs are changing. Commercial

TOWN WHERE TRUSTS DON'T RULE

By

CHARLES DILLON Sabetha, Kansas, with but 2,000 inhabitants, is a peculiar place. It isn't socialistic, it hasn't any radical form of government. Yet it is probably the best governed community in the country. For instance, while the rest of the nation did homage, the past winter, to King Coal, Sabetha with its own municipal heating plant kept its fearless independence. Strangely enough, too, not one lawyer is to be found in this little Kansas town.

THE INVISIBLE DETECTIVE

By CHARLES FREDERICK CARTER The dictograph, that mute but wonderfully efficient listener, has figured successfully in over a thousand cases where first-hand evidence was imperative. Mr. Carter, in his usual clever style, presents in an absorbing way, some of the more striking instances of this automatic detective work.

MINING FOR TIGERS

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C. F. HOLDER

An asphalt trap in California began over a million years ago to ensnare the great sabre tooth tiger. From that day to this all kinds of animals have here met their death.

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