Features
Safeguards for the Panama Canal Locks
Bridging the Hudson River
National Academy of Sciences
Boston Meeting
Points about Needles
The Pharmaceutical Industry of France
The De Pluvy Diving Dress
Some Novel Electric Labor-Saving Devices
A Pocket-Knife Artist
Oceanographic Museum of Monaco
Weapons Weird and Wonderful
The Microphotoscope--An Apparatus for Examining Minute Maps
Birds of an Ocean Island
Business and Personal Wants
The Progress of the Hollow Concrete Block Industry
Departments
- Departments
Correspondence
Notes and Queries
Recently Patented Inventions
Index of Inventions
Patents
