Features
The Rise of Electrostatics
How a Great Telephone System is Designed
Reservoir, Fountain, and Stylographic Pens.—III
Stylographic Pens and Manufacture of Gold Pens
Molding Sand
Lightning and the Electricity of the Air.—II
Some Measurements of the Potential of the Air
Celluloid and Galalith
The Possibilities of Concrete Construction from the Standpoint of Utility and Art
Surveying on the Farm
Leveling
How to make a Gliding Machine
Valuable alloys.—III
White Metal
