Volume 21, Issue 23
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Features
Wire and Tube Drawing
Varnish Rooms
The Berlin Heating Gasworks
The Turkish Hookah
Aerial Navigation
Wood's Harvester Pitman Connection
Iguanas
Pratt's Patent Vent Stopper
Editorial Summary
Reffelt's Calculating Machine
Improved Universal Hanger for Shafting
Useful Blowpipe
Work Performed by the Human Heart Estimated in Horse Powers
Announcenment for 1870—Splendid Work of Art and Cash Premiums to be Given
Oscillations of Water in Steam Boilers
Dirty Shops and Slovenly Workmen
Progress of Invention in the Southern States
How Shoe-Pegs Are Made
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