Features
Machines for Composing Letterpress Printing Surfaces
Compound Marine Boilers
An Old Newcomen Steam Engine
Economy of Mechanical Traction for Street Railways
Honigmann's Method of Boring Mine Shafts
The Link Movement Engine
The Toning of Bromide Prints
Selected Formulæ
Miscellaneous Notes
Electrical Notes
Engineering Notes
Automatic Firing Guns
II. —INTRODUCTION OF RIFLING.
The Bessemer Process Again —Reply of Joseph D. Weeks to His Critics
To the Editor of the SCIENTIFIC AMERICAN :
The Chemical Laboratories of Germany
HISTORIC LABORATORIES.
