Features
Water Glass
The Great Comet Now in Sight
The Stephenson Centenary
Mechanical Inventions
Improved Feed-Water Regulator
Novel Cattle Ringer
Improved Air Pump
Improved Wagon Spring
Explosion of a Plain Cylinder Boiler in Philadelphia
An Interesting Boiler Experiment
Expansion Voltameter
Improved Car Truck
The Electric Boat
The Faure Battery--Stored-Up Electricity
The Prospects and Present State of Photo-Graphy in Natural Colors
Communications Received
Departments
- Departments
Correspondence - July 9, 1881
New Inventions - July 9, 1881
Business and Personal - July 9, 1881
Notes and Queries - July 9, 1881
Index of Inventions - July 9, 1881
New Books and Publications - July 9, 1881
