Feature

Radioactive Grease on Metals Will Detect Surface Flaws

Chemists Find Way to Use Low Grade Italian Bauxite

Piano Tuning Circles Puzzle over New System

Front Matter

Local Anesthetic Treatment Helps Arthritis Sufferers

[Photograph]: Japanese Build Cyclotron

Green “Scum” Has Value as Aquatic Source of Food

League of Nations Sets Standards for Drugs

Eye Is Electric Generator, Current Tiny but Measurable

Tests Pick Mental Patients Who Will Respond to Insulin

New Ignition Cable Cuts Radio Interference

Self-Opening Parachute Is New Safety Invention