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Removal of the Obstructions at Hell Gate

A New Yorker in the Great Salt Mine of Cracow

Rumford's Scientific Discoveries

Horse Block and Hitching Post

Eye Pointed Lasting Awl

Eastern Virginia

Robbins' Improved Pipe Wrench

The Earth Closet System--An Improved Earth Closet

A Question in Social Science

Tornadoes of the Southern States

Facts Relative to the Erie Canal

From Duluth to the Ocean

The Water Supply of London--Sea Baths in Cities

The Drug Clerk Law

Scientific Intelligence- May 20, 1871

Editorial Summary

Launching of the Caisson for the New York Tower of the East River Bridge

Elasticity and Tensile Strength of Wrought Iron

Answers to Correspondents- May 20, 1871

Recent American and Foreign Patents- May 20, 1871

Official List of Patents- May 20, 1871

Issued by the U. S. Patent Office

Queries- May 20, 1871

Applications for Extension of Patents- May 20, 1871

Departments

  • Letters

    Correspondence- May 20, 1871

  • Departments

    Business and Personal- May 20, 1871

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May 20, 1871

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