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Features

Improvement in Battery Guns, Blasting on the Pacific Railroad

Varnish Rooms

Wire and Tube Drawing

By John C Anderson

The Berlin Heating Gasworks

Aerial Navigation

Wood's Harvester Pitman Connection

The Turkish Hookah

Iguanas

Pratt's Patent Vent Stopper

Editorial Summary

Reffelt's Calculating Machine

Improved Universal Hanger for Shafting

Useful Blowpipe

Dirty Shops and Slovenly Workmen

Announcenment for 1870—Splendid Work of Art and Cash Premiums to be Given

Oscillations of Water in Steam Boilers

Work Performed by the Human Heart Estimated in Horse Powers

How Shoe-Pegs Are Made

Progress of Invention in the Southern States

Answers to Correspondents

The Royal Albert Hall of Arts and Sciences

Recent Americans and Foreign Patents

Official List of Patents

Issued by the United States Patent Office

New Publications

Applications for Extension of Patent's

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December 04, 1869

Beyond XX and XY

Biology. Identity. Equality.