Volume 141, Issue 1
You are currently logged out. Please sign in to download the issue PDF.
Features
Looking Ahead With the Editor, July 1929
From Colombian Mountains to the Sea
A Rich Hinterland of Colombia, Seeking Independence of its Old Slow Transportation System, Builds a Road to the Sea
From the Scrap-book of Science, July 1929
The Invaders of England
An Account of the Excavation of Early British Burial Places
The Marvelous Machinery of Muscle
By Learning to Understand the Physics and Chemistry of Our Muscles We May Obtain Increased Control Over Them
A Ship that Carries Trains
Neglected Mushrooms
The Common Meadow Mushroom Is Only One of Many Kinds Which We May Learn to Recognize and Eat With Safety
Tailor-Made Weather for Offices
Equipment in an Office Building in Texas Supplies Air of Proper Temperature and Humidity to All Offices
Sky Photography for Lightning
Estimating the Age of Writing
Whether a Document Is Authentic May Usually be Discovered by Analysis of the Writing. In Legal Cases Such Methods Are Often Crucial
Earth Shine
From the Moon the Earth Would Appear Many Times as Bright as the Moon Appears from the Earth. Interesting New Research on an Old Subject
The Ultra-Violet From the Sun
A Ridiculously Small Quantity of Ozone in the Atmosphere Controls the Amount of Ultra-Violet Which Reaches the Earth's Surface
Pumps Disclose Lake Nemi's Secrets
It is Safe to Fly
High Safety Factors in Construction, and Efficient Personnel, Contribute Materially to Aviation Advancement
The World's Highest Dam for Irrigation
The Stage Goes to School
All Phases of Stagecraft are Taught in New Course in Drama
Underground Arteries for Oil and Gas
Pipelines Hundreds of Miles in Length Surmount Natural Barriers Transporting Fuel to Refineries and Distant Cities
Wings of South America
Aerial Transportation Between the Continents of the Western Hemisphere Is Increasing by Leaps and Bounds
Foiling the Burglar
From Time Immemorial Man Has Tried to Protect His Worldly Goods From the Hands of the Despoiler
Plugging Knot Holes to Salvage Lumber
Banditry by Mail
Medical Fakers Fleece the American Public of Millions of Dollars Annually Through the Mails
Why not Propel Boats by Vibration?
A Study of the Vibratory Principle of Propulsion in Nature, and the Possibility of Utilizing It for Driving Water Craft
Groupings in the Aviation Industry
Status at the Time of Going to Press
Avocados--Alligator Pears
These Tropical "Fruits" May Become as Important as Oranges in Our Daily Diet When We Learn to Like Them
Walking Around Jerusalem
The Ancient Walls of the City of David and Solomon Are Being Restored