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The Davidson “Gyropter” Flying Machine

Advances in Mechanical Engineering

Improvements in Prime Movers and Cutting Metals

By Carl C. Thomas

A New Idea in Air Compression

By Joseph H. Hart

The Repair of Farm Equipment.-II

Ideas for the Handy Farmer

By W. R. Beattie

An Optical Problem

Color Photography

The “Omnicolor” Plate

By H. Quentin

Ammonia Sulphate from Peat

The Woltereck Process

The Mechanism of Immunity

Some Astronomical Curiosities

By J. E. Gore

Simple Solution of Exponential Formulæ

German Diatomaceous Earth

The Artificial Propagation of Marine Sponges

Reinforced Concrete Chimneys

A New use for Concrete Blocks

By Alfred Gradenwitz

A New Electrolyzer

An Inexpensive Decomposer of Water

Electrically Heated Hardening Baths

Loss of Heat in Water-Gas Generators

Electrolytic Lead Compounds

A New Electro-Chemical Method

By Carl Duvivier

Science Notes

Trade Notes and Formule

Engineering Notes


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