Volume 124, Issue 7
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Features
A Giant Job of Underpinning
Building a Subway Beneath Philadelphia's City Hall, with its Inadequate Foundations
Why Balloons Bounce Off Clouds
The Vacuum Tube as an Engineering Problem
Pumping Coal from Mine to Seaboard
A Scheme for Shipping this Fuel via Pipe Lines, Much as Oil now is Shipped
Little Things that Count Big
The Refinement of Details that Marks Our Present Railroad Development, and Some of the Further Needs
How we Think
The Microscopic Structure of the Intellectual Portion of the Human Brain
Leading Navies Compared
First Line Fighting Strength Today and in 1924, When Ships now Building will be in Operation
The Engineers of Ancient Egypt
Mechanical Devices Used in Constructing Pyramids and Erecting Obelisks