Volume 16, Issue 20
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Features
The Paris Exposition
Krupp's New Cannon for the Paris Exhibition
Lubricating Petroleum as a Siccative Oil
Progress of the Commission of Life-Saving Inventions
“Wirbel-Bewegung”
Butterworth's Improved Window Spring
Hub-Boring Machine
Powell's Sleeve Supporter
Uprights on a Plane and on a Curve
Recent American and Foreign Patents
Answers to Correspondents
New Publications
Caution
The Broadway Bridge
Off to Europe
Great Inventors--Their Suffering and Success
Naphthalizing Gas
Lightning Conductors
The Public Railway System
The Pacific Railroad--Its Several Grand Divisions
Science Familiarly Illustrated
Patent Claims
Issued from the U. S. Patent Office