Features
Punching and Shearing
Repolishing Japanned Work
Gas Motor Tram Cars
Cleaning Cavities in Metal Work
Cycle Mechanics
Hints on Baking Enamel
A New Steam Trap
Special Shearing Machine
The Presence of Sodium in Aluminum
The Action of Electric Currents on Mine Surveying Instruments
Electric Furnaces and the Conversion of Carbon into Graphite
Sticky Fly Paper
The Invisible Food of Fish
Telescopic Photography for Amateurs
Miscellaneous Notes
Electrical Notes
Engineering Notes
Selected Formulæ
$250 Prize Essay Competition—The Progress of Invention during the past Fifty Years
Fifth Prize, won by “VERBUM SAP. III.” (FREDERIC DE GARIS).
The Shade Tree Insect Problem in the Eastern United States
THE FALL WEBWORM. (Hyphantria cunea Drury; Figs. 9 to 11.)
