Features
Liquid Air in High Explosives
The Pan-American Exposition
Gold in the Philippines
Gruson Armor in the United States
Photography of Paintings and Drawings
Commercial Production of Liquid Air
Some Smokeless Powder Considerations
The Plant Products of the Philippine Islands
The "Reina Mercedes"
An Iceberg at St. John's, Newfoundland
Pocket Voltmeter and an Electric Soldering Iron
A Chinese Typewriter
A Feed-Water Purifier and Skimmer for Boilers
A Powerful Open Circuit Battery Cell
The Measurement of Shutter Speed
Photography in the Colors of Nature
Navies of the World
The Bird Giants
To Inventors - June 3, 1899
Departments
- Letters
Correspondence - June 3, 1899
- Departments
Index of Inventions - June 3, 1899
Business and Personal - June 3, 1899
Recently Patented Inventions - June 3, 1899
Notes and Queries - June 3, 1899
Patents - June 3, 1899
