Feature

New Device Synchronizes Multi-Engine Plane Motors

Watch for Mercury

First Glances at New Books

Adolescent Crime Has Its Beginnings in Babyhood

New England Faces Problem of a Declining Population

Transatlantic Air Service Planned to Start This Spring

Electric Musical Instrument Imitates Orchestra Pieces

Invent Shells That Burst When They “See” Target

Helium, Sun-Gas, Rescues Sandhogs Ill with “Bends”

In Science Fields

U. S. Naval Gun Factory Is Rushing Production Again

Planet Mars, Symbol of War, Has “Heart” of Iron