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Improved Cooking Vessel

New Double Spindle Drill

Pneumatic Foundations

Thick Cylinders

The Spectroscope Simplified

The Preparation of Gelatin

The Digestive Apparatus

Freight Business of New York City Across the North River

The Chicago Inter-State Industrial Exposition

The American Institute Fair

Scientific and Practical Information


Improved Plow

Iron Ship Construction

A New Preventive for Slipping Belts

Improved Spindle Step

Tanite Emery Grinder with Adjustable Table

Lock Envelope

Car and Passenger Elevator

Sanitary Notes--Milk and its Adulterations

Recent American and Foreign Patents

Answers Correspondents

Communications Received


  • Departments


  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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June 21, 1873

20% Sitewide for President's Day