Volume 24, Issue 18
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Features
Improved Excavator
Tilghman's Process of Cutting Hard Substances
Something about Seeds
Cochineal Insects and their Allies
Mortar Light
Molding and Mixing Machines, used by the Union Stone Company--The Sorel Process of Manufacturing Artificial Stone
Cope & Maxwell's Upright Boiler Feeder
Roofs and Roofing
Proposed Changes in the British Patent Laws
Canal Navigation
Mining Schools in the United States
Scientific Intelligence- April 29, 1871
Uses of Infusorial Silica
Carbolic Acid
Editorial Summary
Recent American and Foreign Patents- April 29, 1871
Queries- April 29, 1871
Answers to Correspondents- April 29, 1871
Official Lists of Patents- April 29, 1871
Issued by the U. S. Patent Office