Volume 24, Issue 21
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Features
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
The Earth Closet System--An Improved Earth Closet
Robbins' Improved Pipe Wrench
A Question in Social Science
Facts Relative to the Erie Canal
Tornadoes of the Southern States
Scientific Intelligence- May 20, 1871
From Duluth to the Ocean
The Drug Clerk Law
The Water Supply of London--Sea Baths in Cities
Editorial Summary
Elasticity and Tensile Strength of Wrought Iron
Launching of the Caisson for the New York Tower of the East River Bridge
Answers to Correspondents- May 20, 1871
Recent American and Foreign Patents- May 20, 1871
Queries- May 20, 1871
Official List of Patents- May 20, 1871
Issued by the U. S. Patent Office