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Features

Colors of the Sea

Improved Excavator

Tilghman's Process of Cutting Hard Substances

By Coleman Sellers

Something about Seeds

By W. W. Bailey

Cochineal Insects and their Allies

By E. C. H. Day

Molding and Mixing Machines, used by the Union Stone Company--The Sorel Process of Manufacturing Artificial Stone

Mortar Light

Cope & Maxwell's Upright Boiler Feeder

Canal Navigation

Roofs and Roofing

Proposed Changes in the British Patent Laws

Carbolic Acid

Uses of Infusorial Silica

Scientific Intelligence- April 29, 1871

Mining Schools in the United States

Editorial Summary

Answers to Correspondents- April 29, 1871

Recent American and Foreign Patents- April 29, 1871

Queries- April 29, 1871

Applications for Extension of Patents- April 29, 1871

Official Lists of Patents- April 29, 1871

Issued by the U. S. Patent Office

Departments

  • Letters

    Correspondence- April 29, 1871

  • Recommended

    New Books and Publications- April 29, 1871

  • Departments

    Business and Personal- April 29, 1871

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April 29, 1871

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