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Contents for March, 1915
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By the use of a little vacuum tube, Peter Cooper Hewitt, the
distinguished scientist and inventor, promises to accomplish marvels
in wireless that have hitherto only been dreamed of.

The Battle That Never Ends

Many years have been spent, many lives lost, and millions of dollars
thrown into the tide of the Columbia River, in a terrific battle be-
tween Man and Nature over navigation at the mouth of this
stream. This is a thrilling story of man exerting his puny strength
against immeasurably gigantic forces and winning in the end be-
cause of his ingenuity and pertinacity

The "Big Four" in Water Power .

Tens of millions of horsepower are going to waste in three of the four
greatest waterfalls in the world. Though all the energy of the
streams is now being lost, there is little reason to fear that, when
the time comes, engineers will not find a way to use it

Our Twelve Great Scientists

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Dr. David Starr Jordan, the great biologist, has established a
world-wide reputation as the greatest authority on fishes. As the
builder of Leland Stanford University, and as a consistent scientific
opponent of war, he has enhanced that reputation

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The cities of Duluth and Superior are the vents for the great wheat
area of the northwest to European markets. The routes to the sea
have recently been deepened and widened so that these cities have
practically become seaports

Hospitality for the Farmer in Town

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Carl Voss

Enterprising towns are now maintaining farmers' clubs which
are used as rest rooms

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Alfalfa is about to be put to a new use, and it looks as if we may
deprive the cattle of this necessity to make a luxury for ourselves.

To Drive Next Battleship by Electricity.

At last the aspirations of electricians are about to be realized in the
battleship California, and the American Navy will be the proud
possessor of a real electric battleship .

High-Speed Bullets and What They Do .

Monroe Woolley

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Since "high speed" has made possible the modern rifle, old ideas as
to the effects of bullets have had to undergo a complete change

Scoring the Grocers in Michigan

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The Wolverine State has found a new way of rewarding the grocer
who keeps his products and his place of business up to a high standard

Increasing Bushels Per Acre

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Pictures that show other phases of the conflict besides those of the
battlefield

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T. C. O'Donnell

78

Home Office: Drexel Avenue and 58th St., Chicago

Eastern Office: 1702 Flatiron Building, New York
Copyright, 1915, by Technical World Magazine

Contents for April, 1915

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If it be true that "The world is but a stage", then one of the
most fascinating scenes is that played by Uncle Sam's engineers and
sturdy settlers, in the work of reclaiming the arid lands of the West

Using a Weapon Twenty Centuries Old.

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An invention by a naval gunner, and lots of nerve on the part of
a diver, combined to set a new record for depth attained in an
ordinary diving suit. How it was done is told in this article

The Case of the Farm Tenant

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