Features
The Greatest Altitudes Attained by Unmanned Sounding Balloons
Progress with the Electric Furnace
Signaling to Mars
Testing Gas Engines and Motors
Some Rules for Engineers
The New Telefunken Telegraph
A Combination of the Arc and Sparfi Systems
Building Bricks of Glass
A New Structural Material
Bamboo in California
Giant Leaves
Some Monstrosities in Foliage
The School Room Dust Problem
The Form and Dimensions of the Sun
Possible Changes
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
How the Snake uses his Tongue
Is It a Sense Organ of Direction
