Features
The Caldera Naval Fight
The Commissionership of Patents
The Disposition of Mining Debris in California
Progress of the North River Tunnel
An Improved Wrench
The Horticultural Building
An Improved Velocipede
A Power Hack Saw
Photographic Notes- July 18, 1891
Valley's Railroad for Lumbermen etc.
Science in the Theater
Permanent Steam Engine Indicator
Departments
- Letters
Correspondence- July 18, 1891
- Recommended
New Books and Publications- July 18, 1891
- Departments
Recently Patented Inventions- July 18, 1891
Notes and Queries- July 18, 1891
Business and Personal- July 18, 1891
Index of Inventions- July 18, 1891
To Inventors- July 18, 1891
Patents!- July 18, 1891
