Features
Improvement in Sawing Machinery
Steam Fire Engine
Notice--Water Wheels
The Fast Line
Combustion and Evaporating Power of Boilers
Aldehyde in the Distillation of Sugar
Marine Locomotives
Pure and Impure Gas
Decimal Coinage in England
Special Notice
Central Africa
Extension of the Telegraph System to Africa
Recent Foreign Inventions
A Curious Dining Hall
Apples without Seeds or Cores
List of Patent Claims
Ditching Machine
Improved Slitting Gauge
Railroad Switches
Improved Wrench
Feeding Printing Presses
Preparing Gold
Improved Lantern
National Secret Documents
Unalterable Bank Bills
Close of our Half Volume
Rejection of an Extension of a Patent
Composition of the Rings of Saturn
The Smithsonian Institute
Purifying Black Lead for Pencils
American Steamboats on the Amazon River
Calico Printing
American Wool
Scientific Darkness
American Coal Statistics
To Correspondents
The Barometer Outdone
Agriculture by Steam
Beverage Preparations
Greaves' Nut Protector
The Niger and its Tributaries
Bread Equal to Pound Cake
Hardening Cast Steel for Cutting
Shipbuilding in Sunderland, Eng., and New-York
Bronze for the Sheathing of Ships
Mechanics
Manufacturers and Inventors
