Volume 123, Issue 17
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Features
Making the Hetch-Hetchy Dam Itself
How California's Big Water Development Is Carried On with Its Own Water
Piloting the Ship with the Ears, Rust Preventives
A Magnetic-Proof House for the Workers
The Romance of Invention--XVIII
William Leroy Emmet--Inventor, Engineer and Builder of Power Plants
Painted Coffee
A Trick of the Trade That Is Little Known Outside Brazil
A Mechanical Age for the Farm
What Nebraska, Through Its State University, Is Doing to Bring It About
Extracting Oil by Electrolytic Action
A Recently Developed Process Which Bids Fair To Be of Economic Moment