Volume 79, Issue 2041supp
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Features
Meroë the Royal City of Ethiopia
Important Discoveries that Indicate Advanced Knowledge of Arts and Sciences
Monorail Electric Cranes
Wireless Telegraphy
A Review of Some Notable Developments of the Past Year
A Practical Fertilizer for Wartime in Germany
Encouraging Tree Planting
Making Safe Steel Rails
A New Process Intended to Meet Modern Railroad Requirements
Waste in Hiring and Discharging Employees
A Discussion of an Important Industrial Problem
Properties of Selenium
Electric Power for Agriculture
New Faunal Conditions in the Canal Zone
Notes of an Expedition to Investigate the Results of the Physical Changes in this Region
Protection against Torpedoes
A Discussion of the New Conditions Created by Mines and Submarines
On the Temperature of the Mercury Arc
Edward Weston's Inventions
Revolutionizing Discoveries that Resulted from Exact Observation and Original Chemical Theories
Long Reinforced Concrete Bridges
The Gas from Blast Furnaces—II
Its Cleaning and Utilization