Features
A Summer School of Biology
Ammonia
Trade Mark Decisions
An Improved Safety Latch for Elevator Doors
A New Plating Dynamo
An Improved Fruit Picking Stand
An Imitation Baseball Game
An Improved Log Loading Machine
An Improved Automatic Regulator
An Improved Mail Pouch Catcher
An Improved Dental Tool
An Improved Stone Polishing Machine
An Improved Gravity Hoist
An Improved Header Brake
Home Made Ornaments
The Sodom and Bog Brook Reservoirs in the Croton Basin, N. Y.
Manufacture of Condensed Milk in Switzerland
The New Merchants' Bridge at St. Louis
Burrowing Sea Urchins
Photographic Notes- July 12, 1890
Scientific American Building Edition- July 12, 1890
Departments
- Recommended
New Books and Publications- July 12, 1890
- Departments
Notes and Queries- July 12, 1890
Business and Personal- July 12, 1890
Recently Patented Inventions- July 12, 1890
Index of Inventions- July 12, 1890
