Volume 24, Issue 14
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Features
Artificial Jewelry
How do you Prove Your Plumb Rule?
Annual Assay of the Coinage
The "Luna" Moth
Egg Tongs
Device for Cleaning Traps in Soil Pipes
Combined Pruning Hook and Saw
What Becomes of all the Steel Pens?--Their Manufacture
The Working of the New York Fire Department
Improved Method of Attaching Knobs to Screws
Improved Door Stop
Johnson's Improved Adjusting Plumb and Level
Progress of the Darien Ship Canal
Inspection of Steam Boilers in Ohio
Practical Instruction in Mechanics and Physics
Whiskey, New and Old
Scientific Education and Religion
Caisson for the New York End of the East River Bridge
The Moral Lubricator
Dangerous Dentistry
Endless Platform Belt Railway for New York
Queries- April 1, 1871
Obituary Notices
Scientific Intelligence- April 1, 1871
Preservation of Wood under Water
Answers to Correspondents- April 1, 1871
Applications for Extension of Patents- April 1, 1871
Official List of Patents- April 1, 1871
Issued by the U. S. Patent Office