The World's Largest Rapid Sand Filter, Dry Cleaning at Home and more
The World's Largest Rapid Sand Filter
Dry Cleaning at Home
The President on National Defense
Germany as Nature's Competitor
and more
Volume 113, Issue 21
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Features
Electrifying the Philadelphia-Paoli Division of the Pennsylvania R. R
Self-Lighting Attachment for Smudge Pots, Transportable Stall Mounted on Motor Truck and more
Waste Heat to Stimulate Plant Growth, Poisonous Sprays
Time Measured Graphically
Efficiency in the Household
Bringing Science to the Aid of Domestic Economy
Providing a Ship with Ears
A System for Locating Other Ships and Icebergs During Fog