Features
Advances in Mechanical Engineering
Improvements in Prime Movers and Cutting Metals
A New Idea in Air Compression
The Repair of Farm Equipment.-II
Ideas for the Handy Farmer
An Optical Problem
Color Photography
The “Omnicolor” Plate
Ammonia Sulphate from Peat
The Woltereck Process
The Mechanism of Immunity
Some Astronomical Curiosities
Simple Solution of Exponential Formulæ
German Diatomaceous Earth
The Artificial Propagation of Marine Sponges
Reinforced Concrete Chimneys
A New use for Concrete Blocks
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
