Volume 33, Issue 25
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Features
Diphtheria
A Valuable Gift by Chemistry to the World
Making Excuses
Publishers' Card
Six Good Reasons Why Every Manufacturer, Mechanic, Inventor, and Artisan Should Become a Patron of the Scientific American
Working Men's Reading Rooms
That Obnoxious Postal Law
Weak Sparks
Steam Cultivation
Recent Improvements in the Screw Propeller
Robertson's Iron Fence
A Non-Retreating Bunsen Burner
Improved Screw Cutting Die and Holder
Plate Shearing Machinery
Donkey Pump
The Krupp Twelve Hundred Pounder Gun
The Trinity Shoals Lighthouse
New Household Articles - December 18, 1875
New Woodwork and House and Carriage Building Inventions - December 18, 1875
New Mechanical and Engineering Inventions - December 18, 1875
Recent American and Foreign Patents - December 18, 1875
New Agricultural Inventions