Improvement in Battery Guns, Blasting on the Pacific Railroad

Wire and Tube Drawing

Varnish Rooms

The Berlin Heating Gasworks

Aerial Navigation

Wood's Harvester Pitman Connection

The Turkish Hookah

Pratt's Patent Vent Stopper

Iguanas

Editorial Summary

Improved Universal Hanger for Shafting

Reffelt's Calculating Machine

Useful Blowpipe

Work Performed by the Human Heart Estimated in Horse Powers

Dirty Shops and Slovenly Workmen

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

Oscillations of Water in Steam Boilers

Progress of Invention in the Southern States

How Shoe-Pegs Are Made

Answers to Correspondents

The Royal Albert Hall of Arts and Sciences

Official List of Patents

Issued by the United States Patent Office

Recent Americans and Foreign Patents

New Publications

Applications for Extension of Patent's