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Features

A New Type of Great Lake Ore Steamer

By Day Allen Willey

The Greatest Altitudes Attained by Unmanned Sounding Balloons

By A. Wagner

Progress with the Electric Furnace

Signaling to Mars

By Edgar Lucien Larkin

Testing Gas Engines and Motors

Some Rules for Engineers

By E. S. Frash

The New Telefunken Telegraph

A Combination of the Arc and Sparfi Systems

By Count Arco

Building Bricks of Glass

A New Structural Material

Bamboo in California

Giant Leaves

Some Monstrosities in Foliage

By S. Leonard Bastin

The School Room Dust Problem

The Form and Dimensions of the Sun

Possible Changes

By F. R. Moulton

Lantern Projection Distances

Sir George Darwin on “Tides in the Solid Earth.”

Correspondence

Malted Coffee

The Charge and Nature of the Alpha Particle

Photographing without Light

The Actinic Activity of resin and Allied Bodies on a Sensitized Plate

Metallography: A New Science

The Application of the Microscope to the Study of Metals

By Walter Rosenhain

How the Snake uses his Tongue

Is It a Sense Organ of Direction

By G. R. O*amp*apos;Reilly

Trade Notes and Formulæ

Electrical Notes

Engineering Notes

Departments

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