Mechanical

HVAC Basics for Beginners

Watch and Clock Escapements

Natural Stability and the Parachute Principle in Aeroplanes

Gas and Petroleum Engines

How to Make Electrical Machines Containing Full Directions for Making Electrical Machines, Induction Coils, Dynamos, and Many Novel Toys to Be Worked by Electricity

The Steam Engine Familiarly Explained and Illustrated

The Aeroplane Speaks

Tractor Principles