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Improved Horizontal Testing Machine

Lathe Vise

The Ocean Tides as a Prime Motor

Entomology in Congress

The Vienna Show in the Senate

Gas Light and Steam Heat

The Duplex Telegraph Instrument in England

What is the Use?

Balancing Machinery

Gears for Changing Direction of Motion

Guide for Setting Slide Valves

The Proportions of Pipes

Early Metallurgy

Professor Tyndall's Fifth Lecture in New York--The Invisible Rays

The Telescope in the Cambridge University

Gleanings in Science and Art

Improved Seed Planter

Cooling Our Houses

New Bridge Over the Nile

Learn to Draw

Dr. Draper's Researches in Actino-Chemistry

Decisions of the Courts

Recent American and Foreign Patents

Value of Patents

AND HOW TO OBTAIN THEM. Practical Hints to Inventors.

Answers to Correspondents


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February 01, 1873

Of Shamrocks and Science

Happy St. Patrick’s Day