Volume 19, Issue 494supp
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Features
Ocean Lightships with Captive Balloons
The Steamer Pittsburg
Machine Guns at the Inventions Exhibition
The Oerlikon Roller Grinding and Grooving Machine
Compressed Air Locomotives
New Secondary Battery
New Thermodynamics
Warmth, Coldness, and Pressure
The Marble Panels of the forum Romanum
Frescoes Found in Rome
Fire-Proof Building in New York
The Bower-Barff “Rustless Iron”
The Method of Making Soap—Laundry and Toilet—With Formulas
By an Experienced Manufacturer